Zobrazeno 1 - 10
of 397
pro vyhledávání: '"Knı́žek, K"'
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
Publikováno v:
In Journal of Alloys and Compounds 25 December 2021 888
The crystal field parameters of 13 trivalent lanthanide ions substituted for La in LaF$_3$ were calculated using the combination of the band structure and Wannier function calculations. Performing an atomic exact diagonalization with thus obtained cr
Externí odkaz:
http://arxiv.org/abs/1407.7669
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
Publikováno v:
Phys. Rev. B 87, 205139 (2013)
A method to calculate the crystal field parameters {\it ab initio} is proposed and applied to trivalent rare earth impurities in yttrium aluminate and to Tb$^{3+}$ ion in TbAlO$_3$. To determine crystal field parameters local Hamiltonian expressed in
Externí odkaz:
http://arxiv.org/abs/1303.1281
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