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Type: Artigo de periódico
Title: Neutron Diffraction On Er1-xcaxba2cu3o7-δ (0.0≤x≤0.3) System: Possible Oxygen Vacancies In Cu-o2 Planes
Author: Awana V.P.S.
Malik S.K.
Yelon W.B.
Cardoso C.A.
De Lima O.F.
Gupta A.
Sedky A.
Narlikar A.V.
Abstract: In the system Er1-xCaxBa2Cu3O7-δ with x = 0.0 to 0.3, the superconducting transition temperature (Tc), as measured from AC susceptibility, decreases with increasing Ca substitution, x. Detailed analysis of the powder neutron diffraction patterns of these samples shows a decrease in oxygen content with increasing x. The orthorhombic distortion decreases slightly and the c-parameter increases slightly with increasing x. Both, the buckling angle [(Cu(2)-O(2)-Cu(2) angle)] and the planer Cu(2)-O(2) distance in Cu-O2 planes, increase with increasing x. Increased Cu(2)-O(2) bond distance indicates a slight decrease in p-type hole carriers in Cu-O2 planes. On comparison with reported results on Tc vs. p-type carriers in high Tc superconducting compounds, it is inferred that decrease in p-type carriers alone cannot account for sharp Tc depression with increasing x in Er1-xCaxBa2Cu3O7-δ system. With increasing x, oxygen vacancies are created in Cu-O2 planes, which along with increased buckling angle might be partly responsible for Tc suppression in this system.
Editor: Elsevier Science Publishers B.V., Amsterdam, Netherlands
Rights: fechado
Identifier DOI: 10.1016/S0921-4534(00)00308-7
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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