Abstract
The changes in crystallographic, magnetic, and transport properties with calcium substitution in deoxygenated R 1− x Ca x Ba 2Cu 3O 6.1 (R=Y, Eu) system have been investigated. The superconductivity is induced at a calcium content of x=0.26–0.3. However, the induced superconductivity exhibits a low critical field. The system R 1− x Ca x Ba 2Cu 3O 6.1 undergoes an insulator to metal transition. The increase in the effective magnetic moment with Ca substitution is detected. The crystal structure undergoes slight modifications. Although, the observed variation of crystal structure forced by Ca doping does not reproduce the structure modifications characteristic of oxygen doping. The discussed changes in properties of R 1− x Ca x Ba 2Cu 3O 6.1 should be mainly related to hole doping, observed as an increase in formal copper valence, which was confirmed by iodometric titration.
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