Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/784
Title: Superconducting cuprates of the series Bi2Ca1-xLnxSr2Cu2O8+ δ (Ln=rare earth or Y)
Authors: Rao, C N R
Nagarajan, R
Vijayaraghavan, R
Vasanthacharya, N Y
Kulkarni, G U
Rao, G Ranga
Umarji, A M
Somasundaram, P
Subbanna, G N
Raju, A R
Sood, A K
Narayana, Chandrabhas
Keywords: superconducting cuprates
Ln=rare earth or Y
Raman band
Bi-O layers
Bi2Ca1-xLnxSr2Cu2O8+ δ
Issue Date: May-1990
Publisher: IOP Publishing Ltd
Citation: Superconductor Science and Technology 3(5), 242-248 (1990)
Abstract: A 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.
Description: Restricted Access
URI: http://hdl.handle.net/10572/784
Other Identifiers: 0953-2048
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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