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dc.contributor.authorSubías, G.-
dc.contributor.authorGarcía, Joaquín-
dc.contributor.authorBeran, Premsyl-
dc.contributor.authorSánchez, María Concepción-
dc.contributor.authorGarcía Muñoz, Josep Lluís-
dc.date.accessioned2009-12-10T11:00:52Z-
dc.date.available2009-12-10T11:00:52Z-
dc.date.issued2006-05-
dc.identifier.citationPhysical Review - Section B - Condensed Matter 73(20): 205107.1-205107.13 (2006)en_US
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10261/19463-
dc.description13 pages, 12 figures.-- PACS number(s): 75.47.Lx, 61.10.-i, 71.30.+hen_US
dc.description.abstractResonant x-ray scattering (RXS) at the Mn K edge has been used to characterize the low temperature ordered phase of Bi0.5Sr0.5MnO3. Strong resonances were observed for the (030), (050), (05/20), (0 7/2 0), (4 0), and (3 0) reflections as the photon energy is tuned through the Mn K edge. The reported azimuthal and polarization dependence of the resonant intensities indicates that the low temperature phase is described as a checkerboard ordering of two types of Mn sites with different local geometrical structures. One of the sites is anisotropic, a tetragonal distorted oxygen octahedron and the other one is isotropic, a nearly undistorted oxygen octahedron. The distinction of these two Mn sites is accompanied by a displacement of the Mn atoms transverse to the b axis. We conclude that this checkerboard-ordered pattern is a common ground state in half-doped manganites. Intermediate valence states according to fractional charge segregation were deduced for the two nonequivalent Mn atoms, far from the localized Mn3+ and Mn4+ ionic species. Hence, the experimental data discard the ionic model of charge and orbital ordering of localized 3d (or 3d-like) states at the Mn site (or the MnO6 cluster). We suggest a description of the RXS in terms of band structure effects and lattice dynamics.en_US
dc.description.sponsorshipThis work was financially supported by the Spanish CICyT Grant No. MAT02-01221 and the MEC (Grant No. MAT2003-07483-C02-02) projects. Financial support from Generalitat de Catalunya (Grants No. GRQ95-8029 and No. PICS2005-14) and DGA is also thanked. P.B. acknowledges financial support from MEC (Spain).en_US
dc.format.extent259768 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsclosedAccessen_US
dc.subjectBismuth compoundsen_US
dc.subjectStrontium compoundsen_US
dc.subjectX-ray scatteringen_US
dc.subjectGround statesen_US
dc.subjectLattice dynamicsen_US
dc.subjectColossal magnetoresistanceen_US
dc.subjectJahn-Teller effecten_US
dc.titleCheckerboard-ordered pattern of Bi0.5Sr0.5MnO3 low-temperature phase probed by x-ray resonant scatteringen_US
dc.typeartículoen_US
dc.identifier.doi10.1103/PhysRevB.73.205107-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.1103/PhysRevB.73.205107en_US
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextnone-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextNo Fulltext-
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