Neutron diffraction evidence for oxygen dimers in Bi-Ca-Sr-Cu-O superconductors

Sequeira, A and Rajagopal, H and Nagarajan, R and Rao, CNR (1989) Neutron diffraction evidence for oxygen dimers in Bi-Ca-Sr-Cu-O superconductors. In: Physica C: Superconductivity, 159 (1-2). pp. 87-92.

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Abstract

A comparative neutron diffraction study of Bi2CaSr2Cu2O8+δ, Bi2Ca2SrCu2O8+δ and Bi2Ca1.5Y0.5SrCu2O8+δ has not only shown the presence of considerable oxygen excess in the Bi layers, but also evidence for oxygen pairing giving rise to O1−2 or O2−2 type species, probably the latter. The proportion of the paired species increases when Y partly replaces Ca. Furthermore, the Tc decreases with an increase in paired species.

Item Type:	Journal Article
Publication:	Physica C: Superconductivity
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 Aug 2010 05:48
Last Modified:	19 Sep 2010 06:14
URI:	http://eprints.iisc.ac.in/id/eprint/31311

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