Ground-state properties of the mixed-valence cobaltites Nd.sub.0.7./sub.Sr.sub.0.3./sub.CoO.sub.3./sub., Nd.sub.0.7./sub.Ca.sub.0.3./sub..CoO.sub.3./sub. and Pr.sub.0.7./sub..Ca.sub.0.3./sub.CoO.sub.3./sub..

0399395 - FZÚ 2014 RIV GB eng J - Článek v odborném periodiku
Jirák, Zdeněk - Hejtmánek, Jiří - Knížek, Karel - Maryško, Miroslav - Novák, Pavel - Šantavá, Eva - Naito, T. - Fujishiro, H.
Ground-state properties of the mixed-valence cobaltites Nd_0.7Sr_0.3CoO₃, Nd_0.7Ca_0.3.CoO₃ and Pr_0.7.Ca_0.3CoO₃.
Journal of Physics-Condensed Matter. Roč. 25, č. 21 (2013), s. 1-12. ISSN 0953-8984. E-ISSN 1361-648X
Grant CEP: GA ČR(CZ) GAP204/11/0713
Institucionální podpora: RVO:68378271
Klíčová slova: perovskites * mixed valence * spin state
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.223, rok: 2013

Electric, magnetic, and thermal properties of three perovskite cobaltites with the same 30% hole doping and ferromagnetic ground state investigated. With decreasing size of large cations, the FM Curie temperature and spontaneous moments of cobalt are gradually suppressed: TC = 130 K, 55 K and 25 K and m = 0.68 μB, 0.34 μB and 0.23 μB for Nd0.7Sr0.3.CoO3, Pr0.7.Ca0.3.CoO3 and Nd0.7.Ca0.3.CoO3. The moment reduction with respect to the moment of the conventional FM La0.7.Sr0.3.CoO3 (TC = 230 K, m = 1.71 μB) in the so-called low spin/intermediate spin (IS/LS) state for Co3+/Co4+ was originally interpreted using a phase-separation scenario
Trvalý link: http://hdl.handle.net/11104/0226687