Zobrazeno 1 - 10
of 613
pro vyhledávání: '"Hejtmánek J"'
Autor:
Knížek, K., Pashchenko, M., Levinský, P., Kaman, O., Jiříček, P., Hejtmánek, J., Soroka, M., Buršík, J.
Spin Seebeck effect has been investigated in Pt/$\varepsilon$-Fe$_2$O$_3$ bilayers. The $\varepsilon$-Fe$_2$O$_3$ thin layer with $40-70$~nm thickness were deposited by a spin-coating method on Y:ZrO$_2$(100) substrates. The prepared layers are highl
Externí odkaz:
http://arxiv.org/abs/1804.02159
Autor:
Hirschner, J., Knizek, K., Marysko, M., Hejtmanek, J., Uhrecky, R., Soroka, M., Bursik, J., Barcelona, A. Anadon, Aguirre, M. H.
Publikováno v:
Phys. Rev. B 96, 064428 (2017)
Spin Seebeck effect (SSE) has been investigated in thin films of two Y-hexagonal ferrites Ba$_2$Zn$_{2}$Fe$_{12}$O$_{22}$ (Zn2Y) and Ba$_2$Co$_{2}$Fe$_{12}$O$_{22}$ (Co2Y) deposited by a spin-coating method on SrTiO$_3$(111) substrate. The selected h
Externí odkaz:
http://arxiv.org/abs/1703.10903
Two samples of the [Ca$_2$CoO$_{3-t}$]$_{0.62}$(CoO$_2$) misfit cobaltate, often denoted as the Ca$_{3}$Co$_{3.93}$O$_{9}$ phase, were prepared from the same ceramic material by the oxygen and argon annealing, resulting in different carrier concentra
Externí odkaz:
http://arxiv.org/abs/1504.03104
Autor:
Kamba, S., Goian, V., Skoromets, V., Hejtmanek, J., Bovtun, V., Kempa, M., Borodavka, F., Vanek, P., Belik, A. A., Lee, J. H., Pacherova, O., Rabe, K. M.
Publikováno v:
Phys. Rev. B 89, 064308 (2014)
Infrared reflectivity spectra of cubic SrMnO$_{3}$ ceramics reveal 18 % stiffening of the lowest-frequency phonon below the antiferromagnetic phase transition occurring at T$_{N}$ = 233 K. Such a large temperature change of the polar phonon frequency
Externí odkaz:
http://arxiv.org/abs/1402.2165
Autor:
Knizek, K., Hejtmanek, J., Marysko, M., Novak, P., Santava, E., Jirak, Z., Naito, T., Fujishiro, H., Cruz, C. R. dela
The structural and magnetic properties of two mixed-valence cobaltites with formal population of 0.30 Co$^{4+}$ ions per f.u., (Pr$_{1-y}$Y$_{y}$)$_{0.7}$Ca$_{0.3}$CoO$_3$ ($y=0$ and 0.15), have been studied down to very low temperatures by means of
Externí odkaz:
http://arxiv.org/abs/1309.4812
Autor:
Knížek, K., Jirák, Z., Hejtmánek, J., Veverka, M., Kaman, O., Maryško, M., Šantavá, E., André, G.
Publikováno v:
J. Phys.-Condens. Mat. 26, 116003 (2014)
Crystal and magnetic structures of the $x=0.2$ member of La$_{\rm 0.8-x}$Tb$_{\rm x}$Ca$_{0.2}$CoO$_3$ perovskite series have been determined from the powder neutron diffraction. Enhancement of the diffraction peaks due to ferromagnetic or cluster gl
Externí odkaz:
http://arxiv.org/abs/1306.6236
Autor:
Fujishiro, H., Naito, T., Takeda, D., Yoshida, N., Watanabe, T., Nitta, K., Hejtmanek, J., Knizek, K., Jirak, Z.
Publikováno v:
Phys. Rev. B 87, 155153 (2013)
Temperature dependence of the X-ray absorption near-edge structure (XANES) spectra at the Pr $L_{3}$- and Tb $L_{3}$-edges was measured for the (Pr$_{1-y}$Tb$_{y})_{0.7}$Ca$_{0.3}$CoO$_{3}$ system, in which a metal-insulator (MI) and spin-state (SS)
Externí odkaz:
http://arxiv.org/abs/1212.4970
Autor:
Hejtmanek, J., Jirak, Z., Kaman, O., Knizek, K., Santava, E., Nitta, K., Naito, T., Fujishiro, H.
We present an extensive investigation (magnetic, electric and thermal measurements and X-ray absorption spectroscopy) of the Pr0.5Ca0.5CoO3 and (Pr1-yYy)0.7Ca0.3CoO3 (y=0.0625-0.15) perovskites, in which a peculiar metal-insulator (M-I) transition, a
Externí odkaz:
http://arxiv.org/abs/1212.4822
Autor:
Jirak, Z., Hejtmanek, J., Knizek, K., Marysko, M., Novak, P., Santava, E., Naito, T., Fujishiro, H.
The electric, magnetic, and thermal properties of three perovskite cobaltites with the same 30% hole doping and ferromagnetic ground state were investigated down to very low temperatures. With decreasing size of large cations, the ferromagnetic Curie
Externí odkaz:
http://arxiv.org/abs/1212.4829
Autor:
Čermák, P., Hejtmánek, J., Plecháček, T., Navrátil, J., Kašparová, J., Holý, V., Zmrhalová, Z., Jarošová, M., Beneš, L., Drašar, Č.
Publikováno v:
In Journal of Alloys and Compounds 30 November 2019 811
