Magnetic and electronic co states in the layered cobaltate GdBaCo2O5.5-x

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dc.contributor.authorGarcía-Fernández, Men_AU
dc.contributor.authorScagnoli, Ven_AU
dc.contributor.authorStaub, Uen_AU
dc.contributor.authorMulders, AMen_AU
dc.contributor.authorJanousch, Men_AU
dc.contributor.authorBodenthin, Yen_AU
dc.contributor.authorMeister, Den_AU
dc.contributor.authorPatterson, BDen_AU
dc.contributor.authorMirone, Aen_AU
dc.contributor.authorTanaka, Yen_AU
dc.contributor.authorNakamura, Ten_AU
dc.contributor.authorGrenier, Sen_AU
dc.contributor.authorHuang, YJen_AU
dc.contributor.authorConder, Ken_AU
dc.date.accessioned2009-06-16T06:20:18Zen_AU
dc.date.accessioned2010-04-30T05:06:06Zen_AU
dc.date.available2009-06-16T06:20:18Zen_AU
dc.date.available2010-04-30T05:06:06Zen_AU
dc.date.issued2008-08en_AU
dc.date.statistics2008-08en_AU
dc.description.abstractWe have performed nonresonant x-ray diffraction, resonant soft and hard x-ray magnetic diffraction, soft x-ray absorption, and x-ray magnetic circular dichroism measurements to clarify the electronic and magnetic high-spin (HS) state at the states of the Co3+, ions in GdBaCo2O5.5. Our data are consistent with a Co-Py(3+) pyramidal sites and a Co-Oc(3+), low-spin (LS) state at the octahedral sites. The structural distortion with a doubling of the a axis (2a(p)X2a(p)X2a(p) cell) shows alternating elongations and contractions of the pyramids, and indicates that the metal-insulator transition is associated with orbital order in the t(2g) orbitals of the Co-Py(3+) HS state. This distortion corresponds to an alternating ordering of xz and yz orbitals along the a and c axes for the Co-Py(3+). The orbital ordering and pyramidal distortion lead to deformation of the octahedra but the Co-Oc(3+) LS state does not allow an orbital order to occur for the Co-Oc(3+), ions. The soft x-ray magnetic diffraction results indicate that the magnetic moments are aligned in the ab plane but are not parallel to the crystallographic a or b axes. The orbital order and the doubling of the magnetic unit cell along the c axis support a noncollinear magnetic structure. The x-ray magnetic circular dichroism data indicate that there is a large orbital magnetic contribution to the total ordered Co moment. © 2008, American Physical Societyen_AU
dc.identifier.citationGarcía-Fernández, M., Scaunoli, V., Staub, U., Mulders, A. M., Janousch, M., Bodenthin, Y., Meister, D., Patterson, B. D., Mirone, A., Tanaka, Y., Nakamura, T., Grenier, S., Huang, Y. J., & Conder, K. (2008). Magnetic and electronic co states in the layered cobaltate GdBaCo2O5.5-x. Physical Review B, 78(5), 13. doi:10.1103/PhysRevB.78.054424en_AU
dc.identifier.govdoc1391en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.pagination13en_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.78.054424en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1382en_AU
dc.identifier.volume78en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectScatteringen_AU
dc.subjectDiffractionen_AU
dc.subjectHigh spin statesen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectX-ray sourcesen_AU
dc.subjectElectronic structureen_AU
dc.titleMagnetic and electronic co states in the layered cobaltate GdBaCo2O5.5-xen_AU
dc.typeJournal Articleen_AU
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