In a clean high-Tc superconductor you do not see the gap
K. Kamarás, S. L. Herr, C. D. Porter, N. Tache, D. B. Tanner, S. Etemad, T. Venkatesan, E. Chase, A. Inam, X. D. Wu, M. S. Hegde, B. Dutta
DOI 10.1103/PhysRevLett.64.84 · Physical Review Letters
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Abstract
The frequency-dependent conductivity of laser-deposited YBa2Cu3O7−δ thin films shows an onset of midinfrared absorption at ∼140 cm−1 and structure in the 400–500-cm−1 region. These low-energy absorptions occur both above and below Tc, making them unlikely to be the superconducting gap in the usual BCS sense. The absorption across the gap is weak because the high-Tc materials are in the clean limit; this weak absorption is masked by the midinfrared absorption.
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. | 91 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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