Surface and superconducting properties of cleaved high-temperature superconductors
J. E. Demuth, B. N. J. Persson, F. Holtzberg, C. V. Chandrasekhar
DOI 10.1103/PhysRevLett.64.603 · Physical Review Letters
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Abstract
High-resolution electron-energy-loss spectroscopy is used to characterize the resistivity, vibrations, and electronic structure of YBa2Cu3O7 and Bi2Sr2CaCu2O8 single crystals cleaved in ultrahigh vacuum. Cleaved surfaces show a variety of terminations with different properties. Spectroscopy on superconducting regions reveal energy gaps in the ab plane corresponding to 7.8±0.3kBTc. The superconducting gap in YBa2Cu3O7 shows a non-BCS temperature dependence and appears to be related to a delocalized excitation near 45 meV that persists well above Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
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