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MoxCu1-xSr2YCu2 y (0.3≤ x ≤1) revisited: Superconductivity, magnetism and the molybdenum oxidation state

hal.structure.identifierDepartamento de Quimica Inorganica I
dc.contributor.authorMARIK, Sourav
hal.structure.identifierDepartamento de Quimica Inorganica I
dc.contributor.authorMORAN, Emilio
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLABRUGÈRE, Christine
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTOULEMONDE, Olivier
hal.structure.identifierDepartamento de Quimica Inorganica I
dc.contributor.authorALARIO-FRANCO, Miguel Ángel
dc.date.issued2012
dc.identifier.issn0022-4596
dc.description.abstractEnA systematic study is reported on the range of stability of molybdenum substituted Sr-based 123 compounds with Mo-Sr-Y-Cu system, synthesized under ambient pressure. All materials crystallize in the space group: P4/mmm and the observed solubility limit of Mo is rather low in this structure because secondary phases start to form as soon as x>0.3 in nominal composition is reached. The antiferromagnetic property in all superconducting multiphase samples can be attributed to the secondary phase Y 2Cu 2O 5. The influence of oxygen annealing on the changes in electronic structure for the pure Mo 0.3Cu 0.7Sr 2YCu 2O y system associated with a non-superconductor to superconductor transition has been investigated by means of X-ray photoelectron spectroscopy, powder X-ray diffraction, magnetic susceptibility and specific-heat measurements. We unambiguously show the predominance of the Mo 5+ state over the Mo 6+ one on both as-synthesized and annealed phases; annealing under an oxygen atmosphere enhances both the Mo 6+ and Cu 2+ amounts. We suggest that the enhancement of Mo 6+ under oxygen annealing is in close relation with the decrease in the O 2p→Cu 3d charge-transfer energy resulting in superconducting properties.
dc.language.isoen
dc.publisherElsevier
dc.subjectCuprates
dc.subjectMagnetism
dc.subjectSuperconductivity
dc.subjectXPS
dc.title.enMoxCu1-xSr2YCu2 y (0.3≤ x ≤1) revisited: Superconductivity, magnetism and the molybdenum oxidation state
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jssc.2012.02.015
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Solid State Chemistry
bordeaux.page40-45
bordeaux.volume191
bordeaux.peerReviewedoui
hal.identifierhal-00707520
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00707520v1
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