Abstract
Samples of the nominal composition Y 1−2xCa xPr xBa 2Cu 3O 7−δ with 0≤ x≤0.4 have been studied by X-ray diffraction techniques, chemical analyses, and measurements of the superconducting transition temperature and the upper critical magnetic field. For x≤0.25, the results indicate that Ca and Pr can both replace Y in agreement with the nominal composition, while for x0.25 only Pr enters the orthorhombic unit cell. Compared to Pr substitution in 1:2:3 we small changes in the depression of T c and strong changes in the critical field slopes. These results suggest that if Pr has a magnetic pair-breaking effect, it is close to being temperature independent.
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