Specific heat of single crystals of YBa2Cu3O7−δ: Fluctuation effects in a bulk superconductor
S. E. Inderhees, M. B. Salamon, Nigel Goldenfeld, J. P. Rice, B. G. Pazol, D. M. Ginsberg, J. Z. Liu, G. W. Crabtree
DOI 10.1103/PhysRevLett.60.1178 · Physical Review Letters
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Abstract
Gaussian fluctuations have been observed in the specific heat of two single crystals YBa2Cu3O7−δ. Deviations from a BCS-type step are well accounted for by 3D Gaussian fluctuations whose amplitude ratio, in the cleaner sample, implies that the number of order-parameter components is 7±2. This result is inconsistent with an O(2) Ginzburg-Landau theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | onset |
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