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Phase transition in Pr.sub.0.5./sub.Ca.sub.0.5./sub.CoO.sub.3./sub. and related cobaltites
- 1.0423009 - FZÚ 2014 RIV DE eng J - Journal Article
Hejtmánek, Jiří - Jirák, Zdeněk - Kaman, Ondřej - Knížek, Karel - Šantavá, Eva - Nitta, K. - Naito, T. - Fujishiro, H.
Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites.
European Physical Journal B. Roč. 86, č. 7 (2013), "305-1"-"305-8". ISSN 1434-6028. E-ISSN 1434-6036
R&D Projects: GA ČR(CZ) GAP204/11/0713
Institutional support: RVO:68378271
Keywords : perovskites * cobaltites * electrotransport * thermal transport
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.463, year: 2013
Presented magnetic, electric and thermal meas.incl. X-ray absorption spectra of the Pr0.5.Ca0.5.CoO3 and (Pr1-yYy)0.7Ca0.3CoO3(y = 0.0625-0.15) perovskites, with a M-I transition, where structural and magnetic anomalies at 76 K and 40-132 K appeared. The inspection of the M-I transition using the XANES data of Pr-L3-edge and Co-K-edge proofs the presence of Pr4+ ions at low temperatures and indicates simultaneously the intermediate spin to low spin crossover of Co species on lowering the temperature. The study thus definitively confirms the synchronicity of the electron transfer between Pr3+ ions and Co3+/4+O3 subsystem and the transition to the low-spin, less electrically conducting phase.
Permanent Link: http://hdl.handle.net/11104/0229109
Number of the records: 1