On the Surface-Derived State of Cleaved YBa2Cu3O7−δ Single Crystals
Angle-resolved photoemission experiments on the cleaved surface of YBa2Cu3O7−δ single crystals revealed an intrinsic surface-derived electronic state around the X and Y point of the Brillouin zone with 0.92 eV binding energy. A surface electronic structure different to the bulk can be of basiç importance for the surface superconductivity of this high-T c cuprate. Here we briefly review recent experimental results and present new hydrogen adsorption experiments, demonstrating the surface character of the 0.92 eV state.
KeywordsBrillouin Zone Surface Peak Bulk Band Surface Superconductivity Fermi Edge
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