Superconducting energy gap and normal-state reflectivity of single crystal Y-Ba-Cu-O
Z. Schlesinger, R. T. Collins, D. L. Kaiser, F. Holtzberg
DOI 10.1103/PhysRevLett.59.1958 · Physical Review Letters
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Abstract
We report the first measurements of the normal-state reflectivity and superconducting energy gap of Y1Ba2Cu3O7−x single crystals. With the electric field in the metallic, a-b plane of our platelike crystals we observe a Drude normal-state reflectivity, and an enhancement of the reflectivity at temperatures below Tc(90 K) which follows the Mattis-Bardeen form. The superconducting energy gap obtained from these measurements is found to be temperature dependent, increasing to a value of 2Δ/kTc≃8 below ≃50 K. Within the Eliashberg-BCS framework this unusually large gap value suggests that Y1Ba2Cu3O7−x is a very strongly coupled superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | onset |
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