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Campo DC | Valor | Lengua/Idioma |
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dc.contributor.author | Subías, G. | - |
dc.contributor.author | García, Joaquín | - |
dc.contributor.author | Beran, Premsyl | - |
dc.contributor.author | Sánchez, María Concepción | - |
dc.contributor.author | García Muñoz, Josep Lluís | - |
dc.date.accessioned | 2009-12-10T11:00:52Z | - |
dc.date.available | 2009-12-10T11:00:52Z | - |
dc.date.issued | 2006-05 | - |
dc.identifier.citation | Physical Review - Section B - Condensed Matter 73(20): 205107.1-205107.13 (2006) | en_US |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.uri | http://hdl.handle.net/10261/19463 | - |
dc.description | 13 pages, 12 figures.-- PACS number(s): 75.47.Lx, 61.10.-i, 71.30.+h | en_US |
dc.description.abstract | Resonant 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.sponsorship | This 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.extent | 259768 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | en_US |
dc.publisher | American Physical Society | en_US |
dc.rights | closedAccess | en_US |
dc.subject | Bismuth compounds | en_US |
dc.subject | Strontium compounds | en_US |
dc.subject | X-ray scattering | en_US |
dc.subject | Ground states | en_US |
dc.subject | Lattice dynamics | en_US |
dc.subject | Colossal magnetoresistance | en_US |
dc.subject | Jahn-Teller effect | en_US |
dc.title | Checkerboard-ordered pattern of Bi0.5Sr0.5MnO3 low-temperature phase probed by x-ray resonant scattering | en_US |
dc.type | artículo | en_US |
dc.identifier.doi | 10.1103/PhysRevB.73.205107 | - |
dc.description.peerreviewed | Peer reviewed | en_US |
dc.relation.publisherversion | http://dx.doi.org/10.1103/PhysRevB.73.205107 | en_US |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | none | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | No Fulltext | - |
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