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Transition from the diamagnetic insulator to ferromagnetic metal in La.sub.1-x./sub.Sr.sub.x./sub.CoO.sub.3./sub..
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SYSNO ASEP 0353298 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Transition from the diamagnetic insulator to ferromagnetic metal in La1-xSrxCoO3. Tvůrce(i) Knížek, Karel (FZU-D) RID, ORCID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Hejtmánek, Jiří (FZU-D) RID, ORCID
Novák, Pavel (FZU-D) RID, ORCIDZdroj.dok. Journal of Magnetism and Magnetic Materials. - : Elsevier - ISSN 0304-8853
Roč. 322, 9-12 (2010), s. 1221-1223Poč.str. 3 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova LnCoO3 ; GGA+U calculation ; spin states transition Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP IAA100100611 GA AV ČR - Akademie věd CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000275746100049 DOI 10.1016/j.jmmm.2009.04.031 Anotace We have analyzed, using the theoretical GGA+U calculations, different configurations of spin states (LS, IS and HS Co3+) and proposed a model that accounts for magnetic and electric transport properties of perovskite cobaltites upon doping by charge carriers. In particular, it appears that the compositional transition from the diamagnetic LS phase of LaCoO3 to the ferromagnetic metallic IS phase in La1-xSrxCoO3 (x > 0.2) involves the same mechanisms as the high-temperature transition in pure LaCoO3. The process occurs gradually via a phase-separated state, where metallic IS domains stabilized through a charge transfer between Co4+ and Co3+ neighbors coexist with the Co4+ poor regions in the LS ground state (or, at higher temperatures, in mixed LS/HS state). This phase separation vanishes when doping in La1-xSrxCoO3 reaches x ~ 0.2, and a uniform IS phase, analogous to that in pure LaCoO3 in the high-temperature limit, is established. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2011
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