High-resolution heat capacity of YBa2Cu3O6.9 over the superconducting transition region
Richard A. Butera
DOI 10.1103/PhysRevB.37.5909 · Physical Review B
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Abstract
High-resolution heat-capacity data have been determined for a single-phase sample of YBa2Cu3O6.9 over the temperature range 77–150 K. Two anomalies were found: a λ-type transition occurring at 86.65 K and a discontinuity accompanied by a first-order transition occurring at 90.30 K. The discontinuity has a value of ΔCp/T=62 mJ (mol f.u.)−1 K−2, where f.u. denotes formula unit. An estimation of the latent heat and entropy associated with the first-order transition is given. The anomalies in the heat capacity are related to the changes in the resistance and Meissner effect and a mixed superconducting-normal state is proposed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.3 | Pressure not reported | onset |
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86.65 | Pressure not reported | zero_resistance |
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86.65 | Pressure not reported | midpoint |
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