Surface State Effects in High-Tc Superconductors
S. H. Liu, R. A. Klemm
DOI 10.1103/PhysRevLett.73.1019 · Physical Review Letters
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Abstract
Under appropriate conditions a band of electronic surface states may exist on the topmost CuO2 layer of a high-Tc superconductor. This layer can then have higher Tc and energy gap values than the bulk. The surface band vanishes at the kx, ky points in the Brillouin zone where the bulk bands touch. Such surface states can cause tunneling results to depend upon the method and the geometry, and alter the interpretation of photoemission measurements of the energy gap. Both experiments are consistent with s-wave order parameter symmetry in high-Tc materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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