Element-specific and bulk magnetism, electronic, and crystal structures of La0.70Ca0.30Mn1-xCrxO3

dc.creatorTerashita, H
dc.creatorCezar, JC
dc.creatorArdito, FM
dc.creatorBufaical, LF
dc.creatorGranado, E
dc.date2012
dc.date38412
dc.date2014-07-30T17:19:20Z
dc.date2015-11-26T17:46:42Z
dc.date2014-07-30T17:19:20Z
dc.date2015-11-26T17:46:42Z
dc.date.accessioned2018-03-29T00:29:16Z
dc.date.available2018-03-29T00:29:16Z
dc.identifierPhysical Review B. Amer Physical Soc, v. 85, n. 10, 2012.
dc.identifier1098-0121
dc.identifierWOS:000301111900008
dc.identifier10.1103/PhysRevB.85.104401
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/64652
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/64652
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1288569
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionThe magnetic interactions in La0.70Ca0.30Mn1-xCrxO3 (x = 0.15, 0.50, and 0.70) are investigated by x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD), high-resolution x-ray powder diffraction, and bulk magnetization measurements. XAS in the Mn and Cr L-2,L-3 edges support stable single valent Cr3+ ions and a varying Mn valence state with x, while the O K edge XAS spectrum reveals local maxima in the O 2p density of states close to the Fermi level due to mixing with Mn and Cr 3d states. A robust antiferromagnetic state is found for x = 0.70 below T-N = 258 K. For x = 0.15, combined XMCD and bulk magnetization measurements indicate a fully polarized ferrimagnetic state for the Mn and Cr spins below T-c = 224 K. For x = 0.50, a reduced ferrimagnetic component dominated by Mn spins is present below T-c = 154 K. No evidence of lattice anomalies due to cooperative charge and orbital orderings is found by x-ray diffraction for all samples. The magnetic properties of this system are rationalized in terms of a competition of ferromagnetic Mn-Mn double exchange and antiferromagnetic Cr-Cr and Cr-Mn superexchange interactions.
dc.description85
dc.description10
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageen
dc.publisherAmer Physical Soc
dc.publisherCollege Pk
dc.publisherEUA
dc.relationPhysical Review B
dc.relationPhys. Rev. B
dc.rightsaberto
dc.rightshttp://publish.aps.org/authors/transfer-of-copyright-agreement
dc.sourceWeb of Science
dc.subjectChromium-doped Manganites
dc.subjectRay Circular-dichroism
dc.subjectSuperexchange Interaction
dc.subjectPowder Diffraction
dc.subjectDouble Exchange
dc.subjectSum-rules
dc.subjectTransition
dc.subjectPerovskite
dc.subjectCr
dc.subject3d
dc.titleElement-specific and bulk magnetism, electronic, and crystal structures of La0.70Ca0.30Mn1-xCrxO3
dc.typeArtículos de revistas


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