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dc.contributor.authorRao, C N R-
dc.contributor.authorNagarajan, R-
dc.contributor.authorVijayaraghavan, R-
dc.contributor.authorVasanthacharya, N Y-
dc.contributor.authorKulkarni, G U-
dc.contributor.authorRao, G Ranga-
dc.contributor.authorUmarji, A M-
dc.contributor.authorSomasundaram, P-
dc.contributor.authorSubbanna, G N-
dc.contributor.authorRaju, A R-
dc.contributor.authorSood, A K-
dc.contributor.authorNarayana, Chandrabhas-
dc.identifier.citationSuperconductor Science and Technology 3(5), 242-248 (1990)en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractA systematic investigation of the properties of the series Bi2Ca1-xLnxSr2Cu2O8+ delta (Ln-rare earth or Y) of superconducting cuprates has been carried out by employing a variety of techniques. In these cuprates, the a and b parameters of the unit cell increase with x while the c parameter decreases. These cuprates show interesting superlattice modulation with both 4b and 8b periodicity depending on the rare earth when x=1.0. This observation suggests that the superlattice modulation has nothing to do with superconductivity, but may be determined by the oxygen stoichiometry. The oxygen excess, delta , increases linearly with x, but the hole concentration shows a maximum around x=0.25 or delta approximately=0.225+or-0.025. Interestingly, Tc also shows a maximum around x=0.25. The authors have examined the nature of copper by XANES and Cu core level spectra. The relative intensity of the satellite in the Cu(2p) spectrum shows a minimum at x=0.25. The Raman band around 630 cm-1 due to the oxygen atoms in Bi-O layers decreases with increase in x, as does the a parameter.en_US
dc.publisherIOP Publishing Ltden_US
dc.rights© 1990 IOP Publishing Ltden_US
dc.subjectsuperconducting cupratesen_US
dc.subjectLn=rare earth or Yen_US
dc.subjectRaman banden_US
dc.subjectBi-O layersen_US
dc.subjectBi2Ca1-xLnxSr2Cu2O8+ δen_US
dc.titleSuperconducting cuprates of the series Bi2Ca1-xLnxSr2Cu2O8+ δ (Ln=rare earth or Y)en_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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