Karel Knížek
Publications:
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K. Ahn, Z. Jirák, K. Knížek, P. Levinský, M. Soroka, L. Beneš, J. Zich, J. Navrátil, J. Hejtmánek
Heat capacity and thermal conductivity of CdCr2Se4 ferromagnet: magnetic field dependence, experiment and calculations
J. Phys. Chem. Solids 174 (2023) 111139(1)
- 111139().
-
Kyo-Hoon Ahn, Jakub Vít, Mariia Pashchenko, and Karel Knížek
Iron nitrides substituted with transition metals: DFT study of promising systems for anomalous Nernst effect
Phys. Rev. B 108 (2023) 075123(1)
- 075123(8).
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P. Baláž, E. Dutková, M. Baláž, N. Daneu, L. Findoráková, J. Hejtmánek, P. Levinský, K. Knížek, M. B. Hudáková, R. Džunda, R. Bureš and V. Puchý
The manipulation of natural mineral chalcopyrite CuFeS2 via mechanochemistry: properties and thermoelectric potential†
Phys. Chem. Chem. Phys. 25 (2023) 31125
- 31136.
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K. Knížek and Z. Jirák
Magnetic proximity effects at the ferrite/5d metal interface: the GGA+U calculations
Phys. Rev. B 108 (2023) 035145(1)
- 035145(8).
-
G. Abbas, F. J. Sonia, Z. A. Zafar, K. Knížek, J. Houdková, P. Jiříček, M. Bouša, J. Plšek, M. Kalbáč, J. Červenka, O. Frank
Influence of structural properties on (de-)intercalation of ClO4− anion in graphite from concentrated aqueous electrolyte
Carbon 186 (2022) 612
- 623.
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G. Abbas, Z. A. Zafar, F. J. Sonia, K. Knížek, J. Houdková, P. Jiříček, M. Kalbáč, J. Červenka, O. Frank
The effects of ultrasound treatment of graphite on the reversibility of the (de)intercalation of an anion from aqueous electrolyte solution
Nanomaterials 12 (22) (2022) 3932(1)
- 3932(14).
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K. Ahn, A. Marmodoro, J. Hejtmánek, Z. Jirák, K. Knížek
Role of spin-orbit coupling in canted ferromagnetism and spin-wave dynamics of SrRuO3
Phys. Rev. B 105 (2022) 245107(1)
- 245107(8).
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M. Soroka, M. Pashchenko, J. Prokleška, J. Buršík, K. Knížek
Spin Seebeck effect in W-type and Z-type hexagonal ferrite thin films
J. Appl. Phys. 132 (2022) 245101(1)
- 245101(8).
-
Z. A. Zafar, G. Abbas, K. Knížek, M. Šilhavík, P. Kumar, P. Jiříček, J. Houdková, O. Frank, J. Červenka
Chaotropic anion based “water-in-salt” electrolyte realizes a high voltage Zn–graphite dual-ion battery
J. Mater. Chem. A 10 (2022) 2064
- 2074.
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Z. A. Zafar, G. Abbas, M. Šilhavík, K. Knížek, O. Kaman, F. J. Sonia, P. Kumar, P. Jiříček, J. Houdková, O. Frank, J. Červenka
Reversible anion intercalation into graphite from aluminum perchlorate “water‐in‐salt” electrolyte
Electrochim. Acta 404 (2022) 139754(1)
- 139754(9).
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Kyo-Hoon Ahn, Miroslav Soroka, Petr Levinský, Karel Knížek, Jiří Hejtmánek, Vladimír Kucek, and Jiří Navrátil
Thermal transport in CuCr2X4 (X=S,Se,Te): Experiment and ab initio calculations
Phys. Rev. B 104 (2021) 085146(1)
- 085146(10).
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Peter Baláž, Marcela Achimovičová, Matej Baláž, Kan Chen, Oleksandr Dobrozhan, Emmanuel Guilmeau, Jiří Hejtmánek, Karel Knížek, Lenka Kubíčková, Petr Levinský, Viktor Puchý, Michael John Reece, Peter Varga, and Ruizhi Zhang
Thermoelectric Cu–S-Based Materials Synthesized via a Scalable Mechanochemical Process
ACS Sustain. Chem. Eng. 9 (2021) 2003
- 2016.
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Peter Baláž, Erika Dutková, Matej Baláž, Róbert Džunda, Jiří Navrátil, Karel Knížek, Petr Levinský and Jiří Hejtmánek
Mechanochemistry for Energy Materials: Impact of High-Energy Milling on Chemical, Electric and Thermal Transport Properties of Chalcopyrite CuFeS2Nanoparticles
ChemistryOpen 10 (2021) 806
- 814.
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I. Jendrzejewska, T. Groń, K. Knížek, M. Pilch, A. Šlebarski, J. Goraus, P. Zajdel, Z. Stoklosa, E. Pietrasik, T. Goryczka, M. Fijalkowski, Z. Barsova, J. Jampilek
Preparation, structure and magnetic, electronic and thermal properties of Dy3+-doped ZnCr2Se4 with unique geometric type spin-glass
J. Solid State Chem. 298 (2021) 122114(1)
- 122114(12).
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I. Jendrzejewska, K. Knížek, J. Kubacki, J. Goraus, T. Goryczka, E. Pietrasik, Z. Barsova, J. Jampilek, B. Witkowska-Kita
Structure and properties of nano- and polycrystalline Mn-doped CuCr2Se4 obtained by ceramic method and grain reduction
Mater. Res. Bull. 137 (2021) 111174(1)
- 111174(13).
-
O. Kaman, D. Kubániová, K. Knížek, L. Kubíčková, M. Klementová, J. Kohout, Z. Jirák
Structure and magnetic state of hydrothermally prepared Mn-Zn ferrite nanoparticles
J. Alloy. Compd. 888 (2021) 161471(1)
- 161471(14).
-
K. Knížek, P. Novák and Z. Jirák
Exchange interactions in ɛ-Fe2O3: GGA + U calculations
J. Phys.-Condens. Mat. 33 (2021) 155502(1)
- 155502(7).
-
Karel Knížek, Miroslav Soroka, Ondřej Kaman, Jarmila Kuličková, Petr Levinský, Jiří Hejtmánek, and Zdeněk Jirák
Electronic and heat transport phenomena in the nanogranular thiospinel
Fe3S4
Phys. Rev. B 103 (2021) 245129(1)
- 245129(17).
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M. Pashchenko, P. Veverka, T. Kmječ, O. Kaman, L. Kubíčková, J. Kohout, M. Klementová, O. Kravchuk, A. Vakula, S. Tarapov, J. Hejtmánek, K. Knížek
Magnetic, FMR and Mössbauer studies of greigite nanoparticles
J. Alloy. Compd. 857 (2021) 157569(1)
- 157569(10).
-
M. Soroka, K. Knížek, Z. Jirák, P. Levinský, M. Jarošová, J. Buršik, and J. Hejtmánek
Anomalous Nernst effect in the ceramic and thin film samples of La0.7Sr0.3CoO3 perovskite
Phys. Rev. Mater. 5 (2021) 035401(1)
- 035401(10).
-
P. Baláž, M. Baláž, E. Dutková, M. Hegedus, M. Rajňák, K. Knížek, J. Hejtmánek, J. Navrátil, M. Achimovičová and J. Briančin
Magnetization as an Effective Tool for Kinetics Evaluation in Mechanochemical Synthesis of Chalcopyrite CuFeS2
Acta Phys. Polon. A 137 (2020) 647
- 649.
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P. Baláž, E. Dutková, P. Levinský, N. Daneu, L. Kubíčková, K. Knížek, M. Baláž, J. Navrátil, J. Kašparová, V. Ksenofontov, A. Möller, J. Hejtmánek
Enhanced thermoelectric performance of chalcopyrite nanocomposite via co-milling of synthetic and natural minerals
Mater. Lett. 275 (2020) 128107(1)
- 128107(4).
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P. Levinský, J. hejtmánek, K. Knížek, M. Pashchenko, J. navrátil, P. Masschelein. E. Dutková, P. Baláž
Nanograinedn- andp-Type Chalcopyrite CuFeS2Prepared by Mechanochemical Synthesis and Sintered by SPS
Acta Phys. Polon. A 137 (2020) 904
- 907.
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J. Navrátil, P. Levinský, J. Hejtmánek, M. Pashchenko, K. Knížek, L. Kubíčková, T. Kmječ, Č. Drašar
Peculiar Magnetic and Transport Properties of CuFeS2: Defects Playa Key Role
J. Phys. Chem. C 124 (2020) 20773
- 20783.
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H. Němec, C. Kadlec, V. Goian, F. Borodavka, V. Železný, M. Kempa, K. Knížek, J. Hejtmánek, J. Buršík, M. Soroka
Metal-insulator transition in (Pr,Y)0.7Ca0.3CoO3 in the far-infrared spectral region
Phys. Rev. B 102 (2020) 195105(1)
- 195105(13).
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K. Knížek, P. Levinský and J. Hejtmánek
LDA+U Calculation of Electronic and Thermoelectric Properties of Doped Tetrahedrite Cu12Sb4S13
J. Electron. Mater. 48 (2019) 2018
- 2021.
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J. Stergar, Z. Jirák, P. Veverka, L. Kubíčková, T. Vrba, J. Kuličková, K. Knížek, F. Porcher, J. Kohout, O. Kaman
Mn-Zn ferrite nanoparticles coated with mesoporous silica as core materiál for heat-triggered release of therapeutic agents
J. Magn. Magn. Mater. 475 (2019) 429
- 435.
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Z. Jirák, O. Kaman, K. Knížek, P. Levinský, M. Míšek, P. Veverka, J. Hejtmánek
High-field magnetoconductance in La-Sr manganites of FM and AFM ground states
J. Magn. Magn. Mater. 456 (2018) 167
- 178.
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K. Knížek, M. Pashchenko, P. Levinský, O. Kaman, J. Houdková, P. Jiříček, J. Hejtmánek, M. Soroka, and J. Buršík
Spin Seebeck effect in ɛ-Fe2O3 thin films with high coercive field
J. Appl. Phys. 124 (2018) 213904(1)
- 213904(8).
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J. Hirschner, M. Maryško, J. Hejtmánek, R. Uhrecký, M. Soroka, J. Buršík, A. Anadón, M. H. Aguirre, and K. Knížek
Spin Seebeck effect in Y-type hexagonal ferrite thin films
Phys. Rev. B 96 (2017) 064428(1)
- 064428(8).
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Z. Jirák, J. Hirschner, O. Kaman, K. Knížek, P. Levinský, M. Maryško, J. Hejtmánek
Structure and transport properties of La1−xSrxMnO3 granular ceramics
J. Phys. D-Appl. Phys. 50 (2017) 075001(1)
- 075001(15).
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O. Kaman, J. Kuličková, V. Herynek, J. Koktan, M. Maryško, T. Dědourková, K. Knížek, Z. Jirák
Preparation of Mn-Zn ferrite nanoparticles and their silica-coated clusters: Magnetic properties and transverse relaxivity
J. Magn. Magn. Mater. 427 (2017) 251
- 257.
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K. Knížek, Z. Jirák, O. Kaman, M. Maryško and F. Damay
Effect of Tb3+ doping in mixed-valence manganites and cobaltites
J. Phys.-Condens. Mat. 29 (2017) 405802(1)
- 405802(9).
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J. Koktan, G. Goglio, J. Hejtmánek, Z. Jirák, K. Knížek, J. Kuličková, M. Maryško, O. Kaman
Magnetoconductivity of the La1-xSrxMnO3@TiO2 Nanocomposite
IEEE Trans. Magn. 53 (2017) 8109606(1)
- 8109606(6).
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P. Veverka, O. Kaman, K. Knížek, P. Novák, M. Maryško, Z. Jirák
Magnetic properties of rare-earth-doped La0.7Sr0.3MnO3
J. Phys.-Condens. Mat. 29 (2017) 035803(1)
- 035803(9).
-
P. Brázda, L. Palatinus, J. Drahokoupil, K. Knížek, J. Buršík
Calcium-induced cation ordering and large resistivity decrease in Pr0.3CoO2
J. Phys. Chem. Solids 96-97 (2016) 10
- 16.
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O. Kaman, J. Hejtmánek, Z. Jirák, K. Knížek, M. Maryško, P. Novák, S.
Vratislav
Effects of Tb3+ dopants in the La1-xSrxMnO3 bulk and nanoparticle ferromagnets
J. Phys.-Condens. Mat. 28 (2016) 206001(1)
- 206001(8).
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H. Němec, K. Knížek, Z. Jirák, J. Hejtmánek, M. Soroka, J. Buršík
Charge transport in thin layer NaxCoO2 (x ∼ 0.63) studied by terahertz spectroscopy
J. Phys.-Condens. Mat. 28 (2016) 355601(1)
- 355601(6).
-
J. Buršík M. Soroka, K. Knížek, J. Hirschner, P. Levinský, J. Hejtmánek
Oriented thin films of Na0.6CoO2 and Ca3Co4O9 deposited by spin-coating method on polycrystalline substrate
Thin Solid Films 603 (2016) 400
- 403.
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P. Zemenová, R. Král, K. Nitsch, K. Knížek, A. Cihlář, A. Bystřický
Characterization and crystallization kinetics of Er-doped Li2O-Y2O3-P2O5 glass studied by non-isothermal DSC analysis
J. Therm. Anal. Calorim. 125 (2016) 1431
- 1437.
-
P. Brázda, L. Palatinus, M. Klementová, J. Buršík, K. Knížek
Mapping of reciprocal space of La0.30CoO2 in 3D: Analysis of superstructure diffractions and intergrowths with Co3O4
J. Solid State Chem. 227 (2015) 30
- 34.
-
K. Knížek
LDA + U calculation of electronic and thermoelectric properties of doped CuCoO2
Phys. Rev. B 91 (2015) 075125(1)
- 075125(8).
-
K. Knížek, Z. Jirák, J. Hejtmánek, P. Brázda, J. Buršík, M. Soroka, P. Beran
Structural study of layered cobaltate Lax/3CoO2 (x ~ 1) at temperatures up to 800 K
J. Solid State Chem. 229 (2015) 160
- 163.
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K. Knížek, P. Novák, Z. Jirák, J. Hejtmánek, M. Maryško, J. Buršík
Magnetism and transport properties of layered rare-earth cobaltates Ln0.3CoO2
J. Appl. Phys. 117 (2015) 17B706(1)
- 17B706(4).
-
P. Novák, K. Knížek, Z. Jirák, J. Buršík
The calculation of rare-earth levels in layered cobaltates Rx/3CoO2 (x≦1)
J. Magn. Magn. Mater. 381 (2015) 145
- 150.
-
J. Hejtmánek, K. Knížek, V. Švejda, P. Horna and M. Sikora
Test System for Thermoelectric Modules and Materials
J. Electron. Mater. 43 (2014) 3726
- 3732.
-
Z. Jirak, J. Hejtmanek, K. Knizek, P. Novak, E. Santava, H. Fujishiro
Magnetism of perovskite cobaltites with Kramers rare-earth ions
J. Appl. Phys. 115 (2014) 17E118 (1)
- 17E118 (3).
-
K. Knizek, Z. Jirak, J. Hejtmanek, M. Veverka, O. Kaman, M. Marysko,
E. Santava, and G. Andre
Effect of Ising-type Tb3+ions on the low-temperature magnetism of La, Ca cobaltite
J. Phys.-Condens. Mat. 26 (2014) 116003(1)
- 116003(9).
-
K. Knížek, Z. Jirák, P. Novák, C. de la Cruz
Non-collinear magnetic structures of TbCoO3 and DyCoO3
Solid State Sci. 28 (2014) 26
- 30.
-
M. Maryško, J. Hejtmánek, Z. Jirák, O. Kaman, K. Knížek
Terbium induced glassy magnetism in La,Ca-based cobaltites
J. Appl. Phys. 115 (2014) 17E103(1)
- 17E103(3).
-
Tomoyuki Naito, Hiroyuki Fujishiro, Terukazu Nishizaki, Norio Kobayashi,
J. Hejtmánek, K. Knížek and Z. Jirák
Suppression of the metal-insulator transition by magnetic field
in (Pr1-yYy)0.7Ca0.3CoO3 (y=0.0625)
J. Appl. Phys. 115 (2014) 233914(1)
- 233914(5).
-
P. Novák, J. Kuneš, K. Knížek
Crystal field of rare earth impurities in LaF3
Opt. Mater. 37 (2014) 414
- 418.
-
P. Novák, V. Nekvasil, K. Knížek
Crystal field and magnetism with Wannier functions: Orthorhombic
rare-earth manganites
J. Magn. Magn. Mater. 358-359 (2014) 228
- 232.
-
M. Veverka, K. Závěta, O. Kaman, P. Veverka, K. Knížek, E. Pollert, M. Burian, P. Kašpar
Magnetic heating by silica-coated Co–Zn ferrite particles
J. Phys. D-Appl. Phys. 47 (2014) 065503(1)
- 065503(11).
-
J. Buršík, R. Kužel, K. Knížek, I. Drbohlav
Oriented Y-type hexagonal ferrite thin films prepared by chemical solution deposition
J. Solid State Chem. 203 (2013) 100
- 105.
-
H. Fujishiro, T. Naito, D. Takeda, N. Yoshida, T. Watanabe, K. Nitta, J. Hejtmánek, K. Knížek, and Z. Jirák
Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr1-yTby)0.7Ca0.3CoO3
Phys. Rev. B 87 (2013) 155153(1)
- 155153(7).
-
J. Hejtmánek, Z. Jirák, O. Kaman, K. Knížek, E. Šantavá, K. Nitta, T. Naito, H. Fujishiro
Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites
Eur. Phys. J. B 86 (2013) 305(1)
- 305(8).
-
Z. Jirák, J. Hejtmánek, K. Knížek, M. Maryško, P. Novák, E. Šantavá, T. Naito, H. Fujishiro
Ground-state properties of the mixed-valence cobaltites Nd0.70Sr0.3CoO3, Nd0.7Ca0.3.CoO3 and Pr0.7.Ca0.3CoO3
J. Phys.-Condens. Mat. 25 (2013) 216006(1)
- 216006(12).
-
J. Kaštil, J. Kamarád, K. Knížek, Z. Arnold, P. Javorský
Peculiar magnetic properties of Er conditioned Ni43Co7Mn31Ga19 at ambient
and hydrostatic pressures
J. Alloy. Compd. 565 (2013) 134
- 138.
-
K. Knížek, J. Hejtmánek, M. Maryško, P. Novák, E. Šantavá, Z. Jirák, T. Naito, H. Fujishiro, C. de la Cruz
Spin-state crossover and low-temperature magnetic state in yttrium-doped Pr0.7Ca0.3CoO3
Phys. Rev. B 88 (2013) 224412(1)
- 224412(8).
-
D. P. Kozlenko, N. T. Dang, S. E. Kichanov, E. V. Lukin, K. Knížek, Z. Jirák, L. S. Dubrovinsky, V. I. Voronin and B. N. Savenko
Pressure-induced structural transformations, orbital order and antiferromagnetism in La0.75Ca0.25MnO3
Eur. Phys. J. B 86 (2013) 360(1)
- 360(8).
-
Z. Németh, A. Szabó, K. Knížek, M. Sikora, R. Chernikov, N. Sas, C. Bogdán, D. L. Nagy, G. Vankó
Microscopic origin of the magnetoelectronic phase separation in Sr-doped LaCoO3
Phys. Rev. B 88 (2013) 035125(1)
- 035125(9).
-
P. Novák, K. Knížek, J. Kuneš
Crystal field parameters with Wannier functions: Application to rare-earth aluminates
Phys. Rev. B 87 (2013) 205139(1)
- 205139(7).
-
P. Novák, K. Knížek, M. Maryško, Z. Jirák and J. Kuneš
Crystal field and magnetism of Pr3+ and Nd3+ ions in orthorhombic perovskites
J. Phys.-Condens. Mat. 25 (2013) 4460001(1)
- 4460001(8).
-
Pavel Žvátora, Miroslav Veverka, Pavel Veverka, Karel Knížek, Karel Závěta, Emil Pollert, Vladimír Král, Graziella Goglio, Etienne Duguet, Ondřej Kaman
Influence of surface and finite size effects on the structural and magnetic properties of nanocrystalline lanthanum strontium perovskite manganites
J. Solid State Chem. 204 (2013) 373
- 379.
-
H. Fujishiro, T. Naito, S. Ogawa, N. Yoshida, K. Nitta, J. Hejtmánek, K. Knížek, and Z. Jirák
Valence Shift of Pr Ion from 3+ to 4+ in (Pr1-yYy)..0.7Ca0.3CoO3 Estimated by X-Ray Absorption Spectroscopy
J. Phys. Soc. Jpn. 81 (2012) 064709(1)
- 064709(5).
-
J. Hejtmánek, K. Knížek, M. Maryško, Z. Jirák, D. Sedmidubský, O. Jankovský, Š. Huber, P. Masschelein, B. Lenoir
Magnetic and magnetotransport properties of misfit cobaltate Ca3Co3.93O9+δ
J. Appl. Phys. 111 (2012) 07D715(1)
- 07D715(3).
-
K. Knížek, J. Hejtmánek, M. Maryško, Z. Jirák, J. Buršík
Stabilization of the high-spin state of Co3+ in LaCo1-xRhxO3
Phys. Rev. B 85 (2012) 134401(1)
- 134401(7).
-
K. Knížek, Z. Jirák, J. Hejtmánek, M. Maryško, J. Buršík
Structure and properties of novel cobaltates Ln0.3CoO2 (Ln = La, Pr, and Nd)
J. Appl. Phys. 111 (2012) 07D707(1)
- 07D707(3).
-
M. Maryško, Z. Jirák, J. Hejtmánek and K. Knížek
Glassy ferromagnetism and phase separation in Pr0.5Ca0.5CoO3
J. Appl. Phys. 111 (2012) 07E110(1)
- 07E110(3).
-
J. Buršík, I. Drbohlav, Z. Frait, K. Knížek, R. Kužel, K. Kouřil
Oriented SrFe12O19 thin films prepared by chemical solution deposition
J. Solid State Chem. 184 (2011) 3085
- 3094.
-
M. Dlouhá, J. Hejtmánek, Z. Jirák, K. Knížek, M. Veverka, S. Vratislav
Structure and Electric Transport in LaCo0.67Cu0.33O3
J. Superconductivity and Novel Magnetism 24 (2011) 747
- 751.
-
T. Gbur, V. Čuba, V. Múčka, M. Nikl, K. Knížek, M. Pospíšil, I. Jakubec
Photochemical preparation of ZnO nanoparticles
J. Nanopart. Res. 13 (2011) 4529
- 4537.
-
V. Goian, S. Kamba, D. Nuzhnyy, P. Vaněk, M. Kempa, V. Bovtun, K. Knížek, J. Prokleška, F. Borodavka, M. Ledinský, I. Gregora
Dielectric, magnetic and structural properties of novel multiferroic Eu0.5Ba0.5TiO3 ceramics
J. Phys.-Condens. Mat. 23 (2011) 025904(1)
- 025904(7).
-
O. Kaman, P. Veverka, Z. Jirák, M. Maryško, K. Knížek, M. Veverka, P. Kašpar, M. Burian, V. Šepelák, E. Pollert
The magnetic and hyperthermia studies of bare
and silica-coated La0.75Sr0.25MnO3 nanoparticles
J. Nanopart. Res. 13 (2011) 1237
- 1252.
-
K. Knížek, J. Hejtmánek, M. Maryško, E. Šantavá, Z. Jirák, J. Buršík, K. Kirakci, P. Beran
Structure and properties of a novel cobaltate La0.30CoO2
J. Solid State Chem. 184 (2011) 2231
- 2237.
-
M. Maryško, Z. Jirák, K. Knížek, P. Novák, J. Hejtmánek, T. Naito, H. Sasaki, and H. Fujishiro
Thermally and field driven spin-state transitions in (Pr(1-y)Yy)Ca0.3CoO3
J. Appl. Phys. 109 (2011) 07E127-1
- 07E127-3.
-
M. Veverka, Z. Jirák, O. Kaman, K. Knížek, M. Maryško,
E. Pollert, K. Závěta, A. Lančok, M. Dlouhá and S. Vratislav
Distribution of cations in nanosize and bulk Co-Zn ferrites
Nanotechnology 22 (2011) 345701(1)
- 345701(7).
-
M. Dlouhá, J. Hejtmánek, Z. Jirák, K. Knížek, P. Tomeš, S. Vratislav
Antiferromagnetic ordering in the double perovskites La2-xSrxCoRuO6
J. Magn. Magn. Mater. 322 (2010) 1189
- 1191.
-
J. Hejtmánek, E. Šantavá, K. Knížek, M. Maryško, and Z. Jirák, T. Naito, H. Sasaki, and H. Fujishiro
Metal-insulator transition and the Pr3+/Pr4+ valence shift in (Pr1-yYy)0.7Ca0.3CoO3
Phys. Rev. B 82 (2010) 165107(1)
- 165107(7).
-
Z. Jirák, E. Hadová, O. Kaman, K. Knížek, M. Maryško, E. Pollert, M. Dlouhá, S. Vratislav
Ferromagnetism versus charge ordering in the Pr0.5Ca0.5MnO3 and La0.5Ca0.5MnO3 nanocrystals
Phys. Rev. B 81 (2010) 024403(1)
- 024403(8).
-
S. Kamba, V. Goian, M. Savinov, E. Buixaderas, D. Nuzhnyy, M. Maryško, M. Kempa, V. Bovtun, J. Hlinka, K. Knížek, P. Vaněk, P. Novák, J. Buršík, Y. Hiraoka, T. Kimura, K. Kouřil, H. Štěpánková
Dielectric, magnetic and lattice dynamics properties of Y-type hexaferrite Ba0.5Sr1.5Zn2Fe12O22: Comparison of ceramics and single crystals
J. Appl. Phys. 107 (2010) 104109(1)
- 104109(7).
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K. Knížek, J. Hejtmánek, P. Novák, Z. Jirák
Charge transfer, valence, and the metal-insulator transition in Pr0.5Ca0.5CoO3
Phys. Rev. B 81 (2010) 155113(1)
- 155113(5).
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K. Knížek, Z. Jirák, J. Hejtmánek, P. Novák
Transition from the diamagnetic insulator to ferromagnetic metal in La1-xSrxCoO3
J. Magn. Magn. Mater. 322 (2010) 1221
- 1223.
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K. Kouřil, V. Chlan, H. Štěpánková, P. Novák, K. Knížek, J. Hybler,
T. Kimura, Y. Hiraoka, J. Buršík
Hyperfine interactions in magnetoelectric hexaferrite system
J. Magn. Magn. Mater. 322 (2010) 1243
- 1245.
-
K. Kouřil, V. Chlan, H. Štěpánková, A. Telfah, P. Novák, K. Knížek,
Y. Hiraoka, T. Kimura
Distribution of Zn in Magnetoelectric Y-Type Hexaferrite
Acta Phys. Polon. A 118 (2010) 732
- 733.
-
M. Maryško, R. Fajgar, J. Šubrt, N. Murafa, K. Knížek
Magnetic properties of FeCo nanoparticles encapsulated in carbon
J. Phys.: Conf. Ser. 200 (2010) 1
- 5.
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M. Maryško, Z. Jirák, K. Knížek, C. Autret-Lambert
Static and dynamic behavior of the cluster phase in LaMn0.6Co0.4O3
J. Magn. Magn. Mater. 322 (2010) 1392
- 1395.
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P. Novák, V. Chlan, K. Knížek
Giant Magnetoelectricity in Aluminium Substituted Y-Hexaferrites
Acta Phys. Polon. A 118 (2010) 723
- 724.
-
V. Procházka, Cz. Kapusta, M. Sikora, H. Štěpánková, V. Chlan, K. Knížek, Z. Jirák
Local surrounding of Mn in LaMn1-xCoxO3 compounds by means of EXAFS on Mn-K
J. Magn. Magn. Mater. 322 (2010) 1198
- 1200.
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K. Z. Rushchanskii, S. Kamba, V. Goian, P. Vaněk, M. Savinov, J. Prokleška, D. Nuzhnyy, K. Knížek, F. Laufek, S. Eckel, S. K. Lamoreaux, A. O. Sushkov, M. Ležaič, N. A. Spaldin
A multiferroic material to search for the permanent electric dipole moment of the electron
Nature Mater. 9 (2010) 649
- 654.
-
P. Tomeš, A. Weidenkaff, J. Hejtmánek, K. Knížek
On the physical properties of Sr1-xNaxRuO3 (x = 0 - 0.19)
Solid State Sci. 12 (2010) 1112
- 1120.
-
M. Veverka, P. Veverka, Z. Jirák, O. Kaman, K. Knížek, M. Maryško, E. Pollert, K. Závěta
Synthesis and magnetic properties of Co1-xZnxFe2O4+γ nanoparticles as materials for magnetic fluid hyperthermia
J. Magn. Magn. Mater. 322 (2010) 2386
- 2389.
-
O. Kaman, E. Pollert, P. Veverka, M. Veverka, E. Hadová, K. Knížek, M. Maryško, P. Kašpar, M. Klementová, V. Grünwaldová, S. Vasseur, R. Epherre, S. Mornet, G. Goglio, E. Duguet
Silica encapsulated manganese perovskite nanoparticles for magnetically induced hyperthermia without the risk of overheating
Nanotechnology 20 (2009) 275610(1)
- 275610(7).
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K. Knížek, J. Hejtmánek, Z. Jirák, P. Tomeš, P. Henry, G. André
Neutron diffraction and heat capacity studies of PrCoO3 and NdCoO3
Phys. Rev. B 79 (2009) 134103(1)
- 134103(7).
-
K. Knížek, Z. Jirák, J. Hejtmánek, P. Novák, Wei Ku,
GGA+U calculations of correlated spin excitations in LaCoO3
Phys. Rev. B 79 (2009) 014430(1)
- 014430(8).
-
Logvinovich D., Hejtmánek J., Knížek K., Maryško M., Homazava N., Tomeš P., Aguiar R., Ebbinghaus S. G., Reller A., Weidenkaff A.
On the magnetism, thermal- and electrical transport of SrMoO2N
J. Appl. Phys. 105 (2009) 023522(1)
- 023522(6).
-
J. Hejtmánek, Z. Jirák, K. Knížek, M. Maryško, M. Veverka, C. Autret
Valence and spin states in perovskites LaCo0.95M0.05O3 (M = Mg, Ga, Ti)
J. Magn. Magn. Mater. 320 (2008) 92
- 95.
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J. Hejtmánek, K. Knížek, M. Maryško, Z. Jirák, D. Sedmidubský, Z. Sofer, V. Peřina, H. Hardtdegen, C. Buchal
On the magnetic properties of Gd implanted GAN
J. Appl. Phys. 103 (2008) 07D107(1)
- 07D107(3).
-
Z. Jirák, J. Hejtmánek, K. Knížek, M. Veverka
Electrical resistivity and thermopower measurements of the hole- and electron-doped cobaltites LnCoO3
Phys. Rev. B 78 (2008) 014432(1)
- 014432(8).
-
M. Kašpar, P. Bílková, A. Bubnov, V. Hamplová, V. Novotná, M. Glogarová, K. Knížek, D. Pociecha
New chlorine substituted liquid crystals possessing frustrated TGBA and SmQ phases
Liq. Cryst. 35 (2008) 641
- 651.
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K. Knížek, Z. Jirák, J. Hejtmánek, P. Henry, G. André
Structural anomalies, spin transitions and charge disproportionation in LnCoO3
J. Appl. Phys. 103 (2008) 07B703(1)
- 07B703(3).
-
V. Procházka, H. Štěpánková, B. Sedlák, Cz. Kapusta, K. Knížek, Z. Jirák, J. Englich, R. Řezníček
NMR study of LaMn1-xCoxO3 perovskites
J. Magn. Magn. Mater. 320 (2008) 12
- 15.
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M. Sikora, K. Knížek, Cz. Kapusta, P. Glatzel
Evolution of charge and spin state of transition metals in the LaMn1-xCoxO3 perovskite series
J. Appl. Phys. 103 (2008) 07C907(1)
- 07C907(3).
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P. Tomeš, J. Hejtmánek, K. Knížek
On the La2-xSrxCoRuO6 double perovskites: Crystal structure, magnetic properties and transport.
Solid State Sci. 10 (2008) 486
- 490.
-
R. Vidya, P. Ravindran, K. Knížek, A. Kjekshus, H. Fjellvåg
Density Functional Theory Studies of Spin, Charge, and Orbital Ordering in YBaT2O5 (T = Mn, Fe, Co).
Inorg. Chem. 47 (2008) 6608
- 6620.
-
V. Bovtun, S. Kamba, S. Veljko, D. Nuzhnyy, K. Knížek, M. Savinov, J. Petzelt
Relaxor-like behavior of a new lead-free tetragonal tungsten bronze Sr2LaTi2Nb3O15 ceramics
J. Appl. Phys. 101 (2007) 054115(1)
- 054115(6).
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A. Chichev, M. Dlouhá, S. Vratislav, J. Hejtmánek, Z. Jirák, K. Knížek, M. Maryško
Neutron diffraction study of Pr0.5Ca0.5CoO3-\gamma (γ=0 and 0.07)
Z. Kristallogr. 26 (2007) 435
- 440.
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A. Chichev, J. Hejtmánek, Z. Jirák, K. Knížek, M. Maryško, M. Dlouhá, S. Vratislav
The low-temperature phase separation in Pr0.5Ca0.5CoO3
J. Magn. Magn. Mater. 316 (2007) e728
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S. Kamba, D. Nuzhnyy, P. Vaněk, M. Savinov, K. Knížek, Z. Shen, E. Šantavá, K. Máca, M. Sadowski, J. Petzelt
Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics
Europhys. Lett. 80 (2007) 27002(1)
- 27002(6).
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M. Miclau, J. Hejtmánek, R. Retoux, K. Knížek, Z. Jirák, R. Fresard, A. Maignan, S. Hebert, M. Hervieu, and C. Martin
Structural and Magnetic Transitions in CaMn1-xWxO3
Chem. Mater. 19 (2007) 4243
- 4251.
-
P. Novák, K. Knížek
Exchange interaction and conductivity in ferroelectric hexaferrite
J. Magn. Magn. Mater. 316 (2007) e587
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P. Novák, K. Knížek, J. Rusz
Magnetism in the magnetoelectric hexaferrite system (Ba1-xSrx)2Zn2Fe12O22
Phys. Rev. B 76 (2007) 024432-1
- 024432-6.
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E. Pollert, K. Knížek, M. Maryško, P. Kašpar, S. Vasseur, E. Duguet
New Tc-tuned magnetic nanoparticles for self-controlled hyperthermia
J. Magn. Magn. Mater. 316 (2007) 122
- 125.
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V. Procházka, Cz. Kapusta, M. Sikora, D. Zajac, K. Knížek, Z. Jirák, H. Štěpánková
EXAFS study of LaMn1-xCoxO3 compounds
J. Magn. Magn. Mater. 310 (2007) e197
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P. Veverka, K. Knížek, E. Pollert, J. Boháček, S. Vasseur, E. Duguet, J. Portier
Strontium ferrite nanoparticles synthesized in presence of polyvinylalcohol: Phase composition, microstructural and magnetic properties
J. Magn. Magn. Mater. 309 (2007) 106
- 112.
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M. Veverka, P. Veverka, O. Kaman, A. Lančok, K. Závěta, E. Pollert, K. Knížek, J. Boháček, M. Beneš, P. Kašpar, E. Duguet, S. Vasseur
Magnetic heating by cobalt ferrite nanoparticles
Nanotechnology 18 (2007) 345704(1)
- 345704(7).
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V. Chichev , M. Dlouhá , S. Vratislav , K. Knížek , J. Hejtmánek , M. Maryško , M. Veverka , Z. Jirák , O. Golosova , P. Kozlenko , and N. Savenko
Structural, magnetic, and transport properties of the single-layered perovskites La2-xSrxCoO4 (x=1.0-1.4)
Phys. Rev. B 74 (2006) 134414(1)
- 134414(8).
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M. Giot, P. Beran, O. Perez, S. Malo, M. Hervieu, B. Raveau, M. Nevřiva, K. Knížek, P. Roussel
Bi1-xCaxMnO3 (x=0.4 and 0.45): X-ray single-crystal and electron microscopy study
Chem. Mater. 18 (2006) 3225
- 3236.
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J. Hejtmánek, M. Veverka, K. Knížek, H. Fujishiro, S. Hebert, Y. Klein, A. Maignan, C. Bellouard, B. Lenoir,
Cobaltites as perspective thermoelectrics
Mat. Res. Soc. Symposium Proceedings 886, 35 (2006)
-
S. Honda, T. Mates, K. Knížek, M. Ledinský, A. Fejfar, J. Kočka, T. Yamazaki, Y. Uraoka, T. Fuyuki
Hydrogenation of polycrystalline silicon thin films
Thin Solid Films 501 (2006) 144
- 148.
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K. Knížek , Z. Jirák , J. Hejtmánek , and P. Novák
Character of the excited state of the Co3+ ion in LaCoO3
J. Phys.-Condens. Mat. 18 (2006) 3285
- 3297.
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K. Knížek , Z. Jirák , J. Hejtmánek , M. Veverka , M. Maryško , C. Hauback , and H. Fjellvag
Structure and physical properties of YCoO3 at temperatures up to 1000 K
Phys. Rev. B 73 (2006) 214443(1)
- 214443(6).
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K. Knížek , P. Novák , and M. Kupferling
Electronic structure and conductivity of ferroelectric hexaferrite: Ab initio calculations
Phys. Rev. B 73 (2006) 153103(1)
- 153103(4).
-
E. Pollert, K. Knížek, M. Maryško, K. Závěta, A. Lančok, J. Boháček, D. Horák, M. Babič
Magnetic poly(glycidyl methacrylate) microspheres containing maghemite prepared by emulsion polymerization
J. Magn. Magn. Mater. 306 (2006) 241
- 247.
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D. Rybicki, M. Sikora, Cz. Kapusta, P. C. Riedi, Z. Jirák, K. Knížek, M. Maryško, E. Pollert, P. Veverka
A 55Mn NMR study of the La0.75Sr0.25MnO3 nanoparticles
phys. status solidi c 3 (2006) 155
- 158.
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M. Sikora , C. Kapusta , K. Knížek , Z. Jirák , C. Autret , M. Borowiec , J. Oates , V. Procházka , D. Rybicki , and D. Zajac
X-ray absorption near-edge spectroscopy study of Mn and Co valence states in LaMn1-xCoxO3 (x=0-1)
Phys. Rev. B 73 (2006) 94426(1)
- 94426(5).
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N. Tomašovičová, K. Knížek, M. Veverka
Temperature dependence of the infrared properties of Hg-Ba-Cu-O high-temperature superconductor
Physica B 378-380 (2006) 455
- 456.
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S. Vasseur , E. Duguet , J. Portier , G. Goglio , S. Mornet , E. Hadová , K. Knížek , M. Maryško , P. Veverka , and E. Pollert
Lanthanum manganese perovskite nanoparticles as possible in vivo mediators for magnetic hyperthermia
J. Magn. Magn. Mater. 302 (2006) 315
- 320.
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C. Autret, J. Hejtmánek, K. Knížek, M. Maryško, Z. Jirák, M. Dlouhá and S. Vratislav
Electric transport and magnetic properties of perovskites LaMn1-xCoxO3 up to 900 K
J. Phys.-Condens. Mat. 17 (2005) 1601
- 1616.
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K. Knizek , Z. Jirak, J. Hejtmanek, M. Veverka, M. Marysko, G. Maris, T. M. Palstra
Structural anomalies associated with the electronic and spin transitions in LnCoO(3)
Eur. Phys. J. B 47 (2005) 213
- 220.
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K. Knizek , P. Novak , and Z. Jirak
Spin state of LaCoO3: Dependence on CoO6 octahedra geometry
Phys. Rev. B 71 (2005) 54420(1)
- 54420(6).
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M. Kupferling , P. Novak , K. Knizek , W. Pieper , R. Grossinger , G. Wiesinger , and M. Reissner
Magnetism in La substituted Sr hexaferrite
J. Appl. Phys. 97 (2005) 10F309(1)
- 10F309(3).
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P. Novák, K. Knížek, M. Küpferling, R. Grössinger, M. W. Pieper
Magnetism of mixed valence (LaSr) hexaferrites
Eur. Phys. J. B 43 (2005) 509
- 515.
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V. Novotná, V. Hamplová, M. Kašpar, M. Glogarová, K. Knížek, S. Diele, G. Pelzl, Ch. Jones, D. Coleman, N. A. Clark
The B2-B7 phase transition in symmetrical bent-shaped mesogens with methoxy substitution.
Liq. Cryst. 32 (2005) 967
- 975.
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J. Hejtmanek , Z. Jirak , K. Knizek , M. Marysko , M. Veverka , and H. Fujishiro
Magnetism, structure and transport of Y1-xCaxCoO3 and La1-xBaxCoO3
J. Magn. Magn. Mater. 272 (2004) E283
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J. Hejtmanek , Z. Jirak , K. Knizek , E. Pollert , C. Martin , and A. Maignan
Phase competition in Pr0.8-xLaxNa0.2Mn1-yMeyO3
J. Magn. Magn. Mater. 272 (2004) E287
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N. Hudakova , K. Knizek , and J. Hejtmanek
The infrared properties of Bi2Y0.1Sr1.9CaCu2O8+delta superconductor
Physica C 406 (2004) 58
- 62.
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Z. Jirák, J. Hejtmánek, K. Knížek, S. Krupička, M. Maryško
Effect of Cr doping in charge ordered Y1-xCaxMnO3 (x~0.5)
J. Magn. Magn. Mater. 272-276 (2004) E1029
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K. Knížek, J. Hejtmánek, Z. Jirák, C. Martin, M. Hervieu, B. Raveau, G. André, F. Bourée
Structure, magnetism and transport properties of Pr1-xSrxMnO3 (x = 0.45 - 0.75) up to 1200 K
Chem. Mater. 16 (2004) 1104
- 1110.
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K. Knizek , Z. Jirak , J. Hejtmanek , M. Marysko , C. Martin , A. Maignan , and M. Hervieu
The nanoscopic separation of magnetic phases in Cr-doped manganites Pr0.44Sr0.56MnO3
J. Magn. Magn. Mater. 272 (2004) E1085
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E. Pollert , J. Hejtmanek , Z. Jirak , K. Knizek , M. Marysko , P. Doumerc , C. Grenier , and J. Etourneau
Influence of the structure on electric and magnetic properties of La0.8Na0.2Mn1-xCoxO3 perovskites
J. Solid State Chem. 177 (2004) 4564
- 4568.
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M. Rodová, A. Cihlář, K. Knížek, K. Nitsch, and N. Solovieva
Preparation and properties of Ce-doped Na-Gd phosphate glasses
Radiat. Meas. 38 (2004) 489
- 492.
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J. Hejtmanek , K. Knizek , Z. Jirak , M. Hervieu , C. Martin , M. Nevriva , and P. Beran
Ordering phenomena and transport properties of Bi1/2Sr1/2MnO3 single crystals
J. Appl. Phys. 93 (2003) 7370
- 7372.
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Z. Jirak , J. Hejtmanek , K. Knizek , M. Marysko , C. Martin , A. Maignan , and M. Hervieu
Magnetoresistive behavior of Cr-doped manganites Pr0.44Sr0.56MnO3
J. Appl. Phys. 93 (2003) 8083
- 8085.
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E. Pollert , J. Hejtmanek , Z. Jirak , K. Knizek , and M. Marysko
Influence of Co doping on properties of Pr0.8Na0.2Mn((1-y))CoyO3 perovskites
J. Solid State Chem. 174 (2003) 466
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M. Rodova, J. Brozek, K. Knizek, and K. Nitsch
Phase transition in ternary caesium lead bromide
J. Therm. Anal. Calorim. 71 (2003) 667
- 673.
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M. Dlouhá, S. Vratislav, Z. Jirák, J. Hejtmánek, K. Knížek, D. Sedmidubský
Structure and magnetic order in Y1-xCaxMnO3 (x = 0.3 and 0.5)
Appl. Phys. A-Mater. 74 (2002) S673
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Z. Jirak , J. Hejtmanek , K. Knizek , M. Marysko , E. Pollert , M. Dlouha , S. Vratislav , R. Kuzel , and M. Hervieu
Structure and magnetism in the Pr1-xNaxMnO3 perovskites (0 <= x <= 0.2)
J. Magn. Magn. Mater. 250 (2002) 275
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K. Knizek , E. Pollert , D. Sedmidubsky , and I. Bryntse
Mercury pressure during synthesis of the HgBa2CaCu2O6+delta superconductor
Physica C 371 (2002) 111
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P. Nemec , I. Nemec , P. Nahalkova , K. Knizek , and P. Maly
Ammonia-free chemical bath deposition of CdS films: tailoring the nanocrystal sizes
J. Cryst. Growth 240 (2002) 484
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D. Sykorova , O. Smrckova , K. Rubesova , and K. Knizek
Influence of B, Al, Ga, In on the composition of Bi(Pb)SrCaCuO system
Physica B 321 (2002) 295
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I. Pelant , P. Fojtik , K. Luterova , J. Kocka , K. Knizek , and J. Stepanek
Room temperature electric field induced crystallization of wide band gap hydrogenated amorphous silicon
Thin Solid Films 383 (2001) 101
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Z. Jirak , J. Hejtmanek , K. Knizek , M. Marysko , V. Sima , and R. Sonntag
Ferromagnetic-antiferromagnetic transition in tetragonal La0.50Sr0.50MnO3
J. Magn. Magn. Mater. 217 (2000) 113
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K. Knizek , M. Veverka , E. Pollert , and I. Bryntse
Preparation and doping of the HgBa2-xSrxCuO4+delta series
Physica C 330 (2000) 27
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D. Sedmidubský, J. Leitner, K. Knížek, A. Strejc, M. Nevřiva
Phase Relations in Hg-Ba-Ca-Cu-O System
Physica C 341-348 (2000) 509
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D. Sedmidubský, J. Leitner, K. Knížek, A. Strejc, M. Veverka
Phase equilibria in the Hg-Ba-Cu-O system
Physica C 329 (2000) 191
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K. Knizek , M. Veverka , and E. Pollert
Preparation of Hg0.8Cr0.2Ba2CuO4+delta under controlled oxygen and mercury partial pressures
Physica C 311 (1999) 303
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K. Knížek, M. Veverka, E. Pollert, I. Bryntse, C. Michel, B. Raveau
Strontium substitution for Barium in Mercury Superconductors
J. Low Temp. Phys. 117 (1999) 879
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K. Knizek , M. Daturi , G. Busca , and C. Michel
Structural, electro-magnetic and catalytic characterisation of the LaMn1-xCuxO3-delta system
J. Mater. Chem. 8 (1998) 1815
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K. Knizek , M. Veverka , E. Hadova , J. Hejtmanek , D. Sedmidubsky , and E. Pollert
Synthesis of HgBa2CuO4+delta by sol-gel method under controlled oxygen pressure; electron and thermal transport properties
Physica C 302 (1998) 290
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V. Šíma, E. Pollert, V. Plecháček, J. Chval, K. Knížek, L. Martini, L. Bigoni, S. Zannella
Microstructure of the Ag/Bi(Pb)-2223 Tapes Prepared by Solid-State Reaction
J. Supercond. 11 (1998) 253
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S. Vratislav , M. Dlouha , J. Hejtmanek , Z. Jirak , and K. Knizek
Structure properties and oxygen content in Y0.6Ca0.2Ba2Cu3Oy (y=6.03-6.89) by neutron diffraction
Physica B 234 (1997) 928
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J. Hejtmanek , Z. Jirak , K. Knizek , M. Dlouha , and S. Vratislav
Oxygen content and superconductivity in Y0.8Ca0.2Ba2Cu3Oy (y=6.03-6.89)
Phys. Rev. B 54 (1996) 16226
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V. Plecháček, J. Hejtmánek, D. Sedmidubský, K. Knížek, E. Pollert, Z. Janů, R. Tichý
MAGNETIC SHIELDING AND TRAPPING PROPERTIES OF BPSCCO SUPERCONDUCTING TUBES
IEEE Trans. Appl. Supercond. 5 (1995) 528
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K. Nitsch, K. Knížek, M. Rodová
X-ray diffraction study of lead chloride
Solid State Commun. 91 (1994) 611
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