Zobrazeno 1 - 10
of 970
pro vyhledávání: '"Jirák, Z."'
Autor:
Belozerova, N.M., Lis, O.N., Rutkauskas, A.V., Lukin, E.V., Kozlenko, D.P., Jirák, Z., Savenko, B.N., Nguyen, N.T., Zhaludkevich, A.L., Kichanov, S.E.
Publikováno v:
In Physica B: Condensed Matter 1 October 2024 690
Autor:
Belozerova, N.M., Kichanov, S.E., Jirák, Z., Kozlenko, D.P., Kaman, O., Lukin, E.V., Savenko, B.N.
Publikováno v:
In Materials Chemistry and Physics 1 April 2021 262
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:
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
Publikováno v:
Solid State Sci. 28, 26 (2014)
The orthoperovskites TbCoO$_3$ and DyCoO$_3$ with Co$^{3+}$ in a non-magnetic low-spin state have been investigated by neutron diffraction down to 0.25 K. Magnetic ordering is evidenced below $T_N=3.3$ K and 3.6 K, respectively, and the ordered arran
Externí odkaz:
http://arxiv.org/abs/1309.2739
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
Publikováno v:
J. Phys.: Condens. Matter 25 (2013) 446001
Fifteen parameters characterizing the crystal field of rare-earth ions in the RMO$_3$ perovskites (R = Pr, Nd, M = Ga, Co) are calculated by expanding the local Hamiltonian expressed in the basis of Wannier functions into a series of spherical tensor
Externí odkaz:
http://arxiv.org/abs/1306.5948
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