On the Surfacegrived State of Cleaved YBa2Cu3O7-δ Single Crystals
S. Harma, G. Mantea, R. Manzkea, J. Finkb and M. Skibowskia
aInstitut für Experimentalphysik, Universität Kiel, Olshausenstr. 40, D-2300 Kiel 1, Germany
bKernforschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik, Postfach 3640, D-7500 Karlsruhe, Germany
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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 basic importance for the surface superconductivity of this high-Tc cuprate. Here we briefly review recent experimental results and present new hydrogen adsorption experiments, demonstrating the surface character of the 0.92 eV state.
DOI: 10.12693/APhysPolA.82.349
PACS numbers: 74.70.-b, 79.60.-i