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Metal-insulator transition and the Pr.sup.3+./sup./Pr.sup.4.+./sup. valence shift in (Pr.sub.1-y./sub.Y.sub.y./sub.).sub.0.7./sub.Ca.sub.0.3./sub.CoO.sub.3./sub..
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SYSNO ASEP 0352107 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Metal-insulator transition and the Pr3+/Pr4.+ valence shift in (Pr1-yYy)0.7Ca0.3CoO3. Author(s) Hejtmánek, Jiří (FZU-D) RID, ORCID
Šantavá, Eva (FZU-D) RID, ORCID
Knížek, Karel (FZU-D) RID, ORCID
Maryško, Miroslav (FZU-D) RID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Naito, T. (JP)
Sasaki, H. (JP)
Fujishiro, H. (JP)Source Title Physical Review. B - ISSN 1098-0121
Roč. 82, č. 16 (2010), 165107/1-165107/7Number of pages 7 s. Language eng - English Country US - United States Keywords spin-state transition ; magnetic-properties ; crystal-field ; transport ; La1-xSrxCoO3 Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA202/09/0421 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000282508400006 DOI 10.1103/PhysRevB.82.165107 Annotation The magnetic, electric, and thermal properties of the (Ln1-yYy0.7Ca0.3CoO3 perovskites (Ln=Pr,Nd) were investigated down to very low temperatures. The main attention was given to a peculiar metal-insulator (M-I) transition, which is observed in the praseodymium based samples with y=0.075 and 0.15 at TM-I=64 K and 132 K, respectively. The study suggests that the transition, reported originally in Pr0.5Ca0.5CoO3, is not due to a mere change in cobalt ions from the intermediate to the low-spin states but is associated also with a significant electron transfer between Pr3+ and Co3+ /Co4+ sites, so that the praseodymium ions occur below TM-I in a mixed Pr3+ /Pr4+ valence. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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