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Type: Artigo de periódico
Title: Structural and superconducting properties of LaBaCaCu3O7+delta system: a neutron diffraction study
Author: Awana, VPS
de Lima, OF
Malik, SK
Yelon, WB
Narlikar, AV
Abstract: The results on structural aspects and superconductivity of LaBaCaCu3O7+delta (La:1113) are reported. Both X-ray and neutron diffraction studies have been carried out on this compound which reveal that this compound crystallizes in the tetragonal structure (space group P4/mmm). Detailed analysis of the neutron diffraction data reveals that the Ca, Ba and La atoms in this compound are intermixed at the nominal La and Ba sites. Nearly 46% of Ca occupy the usual La-site, while the remaining 54% occupies the Ba-site. Consequently, a corresponding amount of La substitutes at the Ba-site. The intermixing of Ca, Ba and La sites randomizes the chain site oxygens leading to a tetragonal structure for this compound despite an oxygen content close to 7. These occupancy refinements explain the tetragonal structure of the compound, despite having an oxygen content close to 7.04, The compound studied presently shows a sharp superconducting transition at about 68 K. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Subject: LaBaCaCu3O7+delta
neutron diffraction
solid state reaction
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica C. Elsevier Science Bv, v. 314, n. 41671, n. 93, n. 97, 1999.
Rights: fechado
Identifier DOI: 10.1016/S0921-4534(99)00035-0
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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