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Thermodynamic evidence for a density-of-states peak near the Fermi level in YBa2Cu3O7-y.

Thermodynamic properties such as the specific-heat discontinuity at the transition temperature (T c ), ΔC/T c , and the zero-temperature critical field, H c (0), of oxygen-deficient YBa 2 Cu 3 O 7-y are analyzed to show that, within the framework of the BCS formalism, the density of states (DOS) at the Fermi level is peaked at y=0. The energy dependence of the DOS is considered for several models and found to be consistent with the Fermi level lying close to a two-dimensional van Hove singularity