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|Type:||Artigo de periódico|
|Title:||Structural Studies On Er1-xcaxba2cu3o7-δ: Oxygen Vacancies In Cu - O2 Planes|
De Lima O.F.
|Abstract:||In the Er1-xCaxBa2Cu3O7-δ system, 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 with increasing x. Both, the buckling [Cu(2)-O(2)-Cu(2)] angle and the planar 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. With increasing x, oxygen vacancies are created in Cu-O2 planes, which along with increased buckling angle, may be partly responsible for Tc suppression in this system. © 2000 Elsevier Science B.V All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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