Specific Heat of YBa2Cu3O7: Origin of the "Linear" Term and Volume Fraction of Superconductivity

Norman E. Phillips; R. A. Fisher; J. E. Gordon; S. Kim; A. M. Stacy; M. K. Crawford; E. M. McCarron, III

doi:10.1103/PhysRevLett.65.357

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Specific Heat of YBa2Cu3O7: Origin of the "Linear" Term and Volume Fraction of Superconductivity

Norman E. Phillips, R. A. Fisher, J. E. Gordon, S. Kim, A. M. Stacy, M. K. Crawford, E. M. McCarron, III

DOI 10.1103/PhysRevLett.65.357 · Physical Review Letters

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Abstract

Correlations of the coefficient of the "linear" term in the specific heat, γ(0), and the discontinuity at Tc, ΔC(Tc), with a measured concentration of Cu2+ magnetic moments suggest the operation of a pairbreaking mechanism that limits the transition to the superconducting state and produces a contribution to γ(0). There is no evidence for the existence of an intrinsic contribution to γ(0). The value of ΔC(Tc) for a sample provides a measure of the volume fraction of superconductivity and a basis for correcting measured values of parameters to those characteristic of the fully superconducting state. Estimates of several quantities relevant to the strength of coupling are given.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	midpoint
YBa2(Cu1-xZnx)O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	midpoint