Heat-capacity studies of reduced-oxygen-content YBa2Cu3O7−x near the superconducting transition

K. Ghiron; M. B. Salamon; B. W. Veal; A. P. Paulikas; J. W. Downey

doi:10.1103/PhysRevB.46.5837

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Heat-capacity studies of reduced-oxygen-content YBa2Cu3O7−x near the superconducting transition

K. Ghiron, M. B. Salamon, B. W. Veal, A. P. Paulikas, J. W. Downey

DOI 10.1103/PhysRevB.46.5837 · Physical Review B

T1

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Abstract

We have performed high-resolution ac calorimetry near the superconducting transition of single crystals of reduced-oxygen-content YBa2Cu3O7−x. The heat-capacity anomaly decreases dramatically with Tc(x) despite the fact that the transition width and the Meissner fraction indicate that the samples are of similar quality. In addition, the sensitivity of the heat-capacity anomaly to magnetic fields is several times stronger in these samples than has been observed in previous work on fully oxygenated samples. The reduction in the amplitude of the heat-capacity anomaly corresponds to the reduction in the apparent density of states at the Fermi surface.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90.5	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89.3	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87.8	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	86	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	unknown