Abstract
We have measured the specific heat, C, of a number of samples of YBCO, and interpret the results as showing the existence of localized magnetic moments on the YBCO lattice that suppress the transition to the superconducting state. Both the extent of the transition [as measured, for example, by the “jump” in C at Tc, ΔC(Tc)] and the magnitude of the low-temperature “linear” term in C, γ(O)T, are correlated with the concentration of these moments in the way expected for pair-breaking centers: γ(O) increases and ΔC(Tc)/Tc decreases with increasing moment concentration. The contribution to γ(O) associated with these pair-breaking centers, together with that previously recognized as arising from impurity phases, accounts completely for the observed γ(O). We are not aware of other results that are inconsistent with these correlations, and conclude that there is no contribution to γ(O) that is an intrinsic property of the superconducting state in YBCO.
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