Enhancement of the Curie temperature in NdBaCo2O5.5 by a-site Ca substitution

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dc.contributor.authorKolesnik, Sen_AU
dc.contributor.authorDabrowski, Ben_AU
dc.contributor.authorChmaissem, Oen_AU
dc.contributor.authorAvci, Sen_AU
dc.contributor.authorHodges, JPen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorŚwierczek, Ken_AU
dc.date.accessioned2014-03-25T00:18:08Zen_AU
dc.date.available2014-03-25T00:18:08Zen_AU
dc.date.issued2012-08-24en_AU
dc.date.statistics2014-03-25en_AU
dc.description.abstractLayered cobaltites RBaCo2O5.5 (R = rare earth and Y) undergo a sequence of magnetic and electronic transitions between antiferromagnetic/ferrimagnetic/paramagnetic and insulating/paramagnetic metallic states with respective transition temperatures T-N (similar to 230-260 K) < T-C (similar to 250-290 K) < T-MI (similar to 360 K). We have synthesized a Nd1-xCaxBaCo2O5.5 series (0 <= x <= 0.2) of cation-[(Nd,Ca)/Ba]-ordered and oxygen vacancy-ordered materials and investigated them by neutron diffraction, magnetization, and electronic and thermal transport. We observe that upon Ca doping, T-N is decreasing to 0 for x = 0.1 and T-C is increasing and coincides with T-MI for x > 0.12, which weakly changes with Ca substitution from similar to 360 to similar to 340 K. This is the largest enhancement of T-C observed for these cobaltites. Unlike hole doping by adding oxygen, Ca doping does not disrupt the cation and oxygen vacancy orderings up to x = 0.20. © 2012, American Physical Society.en_AU
dc.identifier.articlenumber64434en_AU
dc.identifier.citationKolesnik, S., Dabrowski, B., Chmaissem, O., Avci, S., Hodges, J. P., Avdeev, M., & Świerczek, K. (2012). Enhancement of the Curie temperature in NdBaCo2O5.5 by a-site Ca substitution. Physical Review B, 86(6), Article Number 064434. doi:10.1103/PhysRevB.86.064434en_AU
dc.identifier.govdoc4592en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.86.064434en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5298en_AU
dc.identifier.volume86en_AU
dc.language.isoenen_AU
dc.publisherAmerical Physical Societyen_AU
dc.subjectParamagnetismen_AU
dc.subjectMagnetismen_AU
dc.subjectSpin glass stateen_AU
dc.subjectCalciumen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectOxygenen_AU
dc.titleEnhancement of the Curie temperature in NdBaCo2O5.5 by a-site Ca substitutionen_AU
dc.typeJournal Articleen_AU
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