Abstract
The concentration ( n 2 ) of Cu 2+ magnetic moments located on the YBa 2 Cu 3 O 7 lattice is determined by the specific heat in a 7 T magnetic field. The discontinuity in specific heat at T c [Δ C ( T c )] and also the coefficient of the linear term [γ(0)] are correlated with n 2 in a way that suggests the operation of a pair-breaking mechanism that limits the transition to the superconducting state and provides a criterion for the volume fraction of superconductivity. γ(0) can be represented by the sum of two contributions, both associated with Cu 2+ moments, implying that there is no contribution that is an intrinsic property of the superconducting state. The interpretation of the data provides estimates of parameters relevant to the recognition of strong-coupling effects.
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