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Structure and properties of novel cobaltates Ln.sub.0.3./sub.CoO.sub.2./sub. (Ln = La, Pr, and Nd)
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SYSNO ASEP 0383726 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structure and properties of novel cobaltates Ln0.3CoO2 (Ln = La, Pr, and Nd) Author(s) Knížek, Karel (FZU-D) RID, ORCID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Hejtmánek, Jiří (FZU-D) RID, ORCID
Maryško, Miroslav (FZU-D) RID
Buršík, Josef (UACH-T) RID, ORCID, SAISource Title Journal of Applied Physics. - : AIP Publishing - ISSN 0021-8979
Roč. 111, č. 7 (2012), "07D707-1"-"07D707-3"Number of pages 3 s. Language eng - English Country US - United States Keywords thermoelectric and thermomagnetic effects ; heat capacity ; saturation moments and magnetic susceptibilities ; nonmetals ; Insulators ; low-field transport Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA203/09/1036 GA ČR - Czech Science Foundation (CSF) GA202/09/0421 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100521 - FZU-D (2005-2011) AV0Z40320502 - UACH-T (2005-2011) UT WOS 000303282401170 DOI 10.1063/1.3672241 Annotation Layered cobaltates LnxCoO2 (Ln=La, Pr, Nd; x ~ 0.30), isostructural with well known thermoelectrics NaxCoO2, have been characterized by diffraction methods and probed by the electric transport, magnetic and heat capacity measurements. The thermopower increases with temperature and saturates above room temperature at a large value ~ 175 lV=K. The conductivity is affected by occupational disorder and follows Mott’s T-1/n law. The main attention is given to Pr0.3CoO2 and Nd0.3CoO2, in which the spins of hole carriers in the CoO2 layers coexist with localized magnetic moments of Pr3+ or Nd3+. The systems are found paramagnetic down to the lowest temperatures and behave accordingly to the non-Kramers or Kramers character of the rare earth ions. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2013
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