Abstract
Pr substitution in the 123 superconductors lowers the critical temperature, Tc, drastically. Equal amounts of Ca and Pr were doped into the RE1−2xCaxPrxBa2Cu3O7−δ superconductors (RE=Y, x≤0.2 and Nd, x≤0.1) to isolate the linear term in this depression, often assigned to magnetic pair breaking. Uemura et al found a universal linear relation between Tc and the muon spin relaxation rate δ in high Tc cuprate superconductors with a saturation close to the maximum Tc. Our results indicate a faster decrease of Tc with decreasing δ in the saturaton regime than for Pr doping only and this rate is in turn faster than in oxygen doped 123, indicating multiple effects in the depression of Tc with Pr doping only.
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