Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorVijayaraghavan, R-
dc.contributor.authorRangavittal, N-
dc.contributor.authorKulkarni, G U-
dc.contributor.authorGrantscharova, Emilia-
dc.contributor.authorRow, T N Guru-
dc.contributor.authorRao, C N R-
dc.identifier.citationPhysica C 179(1-3), 183-190 (1991)en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractStructure and superconducting properties of Tl1-yPb(y)Y1-xCa(x)Sr2Cu2O7 (y = 0.0, 0.1, 0.25 and 0.5), derived from the parent insulator TlYSr2Cu2O7, have been investigated for different values of x. XANES studies show Pb to be in the 4+ state while Tl is in the 3+ state, suggesting thereby that in this series, (x-y) approximately corresponds to the hole concentration. The in-plane Cu-O distance decreases with increase in x for all values of y. The apical Cu-O distance as well as the Tl(Pb)-O(2) distance show anomalies at x = 0.5 in the series with y = 0.25; at this composition, T(c) also reaches a maximum. In general, the composition (value of x) at which the T(c) of Tl1-yPb(y)Y1-xCa(x)Sr2Cu2O7 reaches a maximum depends on the Pb content and the maximum T(c) itself increases with increase in y, reaching a value of 105 K at y = 0.5. More interestingly, a maximum T(c) occurs at an (x-y) value of approximately 0.25, which is close to the hole concentration at maximum T(c) in other cuprate superconductors containing two CuO2 layers.en_US
dc.publisherElsevier Science BVen_US
dc.rights© 1991 Elsevier Science BVen_US
dc.subjectOxide Superconductorsen_US
dc.subjectCrystal Structureen_US
dc.titleStructure and superconducting properties of Tl1-yPbyY1-xCaxSr2Cu2O7 Dependence of Tc on hole concentrationen_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

Files in This Item:
File Description SizeFormat 
  Restricted Access
476.15 kBAdobe PDFView/Open Request a copy

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.