Abstract
We report measurements of the susceptibility under applied hydrostatic pressure for samples of YBa 2Cu 3O 6.9 with up to 10 at.% substitution of Fe, Ni and Zn for Cu. We find a very large shift of the superconducting transition temperature T c for samples with higher concentrations of Fe and Zn. The numerical values for dln T c/d p range up to 1.2×10 −2/kbar. The anomalously high pressure shifts of T c are found to correlate with very inhomogeneous superconducting ground states. The results indicate that the main positive contribution to d T c/d p for these inhomogeneous superconductors is due to a delocalization of charge carriers under applied hydrostatic pressure.
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