Nature of the copper species in superconducting YBa2Cu3O7

Sarma, D. D. ; Rao, C. N. R. (1988) Nature of the copper species in superconducting YBa2Cu3O7 Solid State Communications, 65 (1). pp. 47-49. ISSN 0038-1098

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The nominal composition of YBa2Cu3O7 oxide suggests that 33% of the copper should be in the 3+ state. In structural studies, Cu3+ and Cu2+ ions have been assigned specific sites based on their preferred coordinations, and many of the models of superconductivity also require the presence of Cu3+. Our studies however show that Cu is present only in the Cu1+ and Cu2+ states, the proportion of the former increasing with decreasing temperature. It appears that there is no clear experimental evidence for the presence of Cu3+ in YBa2Cu3O7.

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