Magnetic and transport properties of the spin-state disordered oxide La0.8Sr0.2Co1-xRhxO3-[delta]

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorShibasaki, Soichiro
dc.contributor.authorTerasaki, Ichiro
dc.contributor.authorNishibori, Eiji
dc.contributor.authorSawa, Hiroshi
dc.contributor.authorLybeck, Jenni
dc.contributor.authorYamauchi, Hisao
dc.contributor.authorKarppinen, Maarit
dc.contributor.departmentKemian laitosfi
dc.contributor.departmentDepartment of Chemistryen
dc.contributor.schoolKemian tekniikan korkeakoulufi
dc.contributor.schoolSchool of Chemical Technologyen
dc.date.accessioned2015-10-06T09:01:52Z
dc.date.available2015-10-06T09:01:52Z
dc.date.issued2011
dc.description.abstractWe report measurements and analysis of magnetization, resistivity, and thermopower of polycrystalline samples of the perovskite-type Co/Rh oxide La0.8Sr0.2Co1-xRhxO3-[delta]. This system constitutes a solid solution for a full range of x, in which the crystal structure changes from rhombohedral to orthorhombic symmetry with increasing Rh content x. The magnetization data reveal that the magnetic ground state immediately changes upon Rh substitution from ferromagnetic to paramagnetic with increasing x near 0.25, which is close to the structural phase boundary. We find that one substituted Rh ion diminishes the saturation moment by 9 μB, which implies that one Rh3+ ion makes a few magnetic Co3+ ions nonmagnetic (the low-spin state) and causes disorder in the spin state and the highest occupied orbital. In this disordered composition (0.05⩽x⩽0.75), we find that the thermopower is anomalously enhanced below 50 K. In particular, the thermopower of x=0.5 is larger by a factor of 10 than those of x=0 and 1, and the temperature coefficient reaches 4 μV/K2, which is as large as that of heavy-fermion materials such as CeRu2Si2.en
dc.description.versionPeer revieweden
dc.format.extent094405/1-7
dc.format.mimetypeapplication/pdfen
dc.identifier.citationShibasaki, Soichiro & Terasaki, Ichiro & Nishibori, Eiji & Sawa, Hiroshi & Lybeck, Jenni & Yamauchi, Hisao & Karppinen, Maarit. 2011. Magnetic and transport properties of the spin-state disordered oxide La0.8Sr0.2Co1-xRhxO3-[delta]. Physical Review B. Volume 83, Issue 9. 094405/1-7. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.83.094405.en
dc.identifier.doi10.1103/physrevb.83.094405
dc.identifier.issn1550-235X (electronic)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/17946
dc.identifier.urnURN:NBN:fi:aalto-201510064531
dc.language.isoenen
dc.publisherAmerican Physical Society (APS)en
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseriesVolume 83, Issue 9
dc.rights© 2011 American Physical Society (APS). This is the accepted version of the following article: Shibasaki, Soichiro & Terasaki, Ichiro & Nishibori, Eiji & Sawa, Hiroshi & Lybeck, Jenni & Yamauchi, Hisao & Karppinen, Maarit. 2011. Magnetic and transport properties of the spin-state disordered oxide La0.8Sr0.2Co1-xRhxO3-[delta]. Physical Review B. Volume 83, Issue 9. 094405/1-7. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.83.094405, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.094405.en
dc.rights.holderAmerican Physical Society (APS)
dc.subject.keywordperovskite-type Co/Rh oxideen
dc.subject.keywordpolycrystalline samplesen
dc.subject.keywordthermopoweren
dc.subject.keywordresistivityen
dc.subject.keywordmagnetizationen
dc.subject.otherChemistryen
dc.subject.otherPhysicsen
dc.titleMagnetic and transport properties of the spin-state disordered oxide La0.8Sr0.2Co1-xRhxO3-[delta]en
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.dcmitypetexten
dc.type.versionFinal published versionen
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