ACTA

On the Surfacegrived State of Cleaved YBa₂Cu₃O_7-δ Single Crystals

S. Harm^a, G. Mante^a, R. Manzke^a, J. Fink^b and M. Skibowski^a
^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 YBa₂Cu₃O_7-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-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.

DOI: 10.12693/APhysPolA.82.349
PACS numbers: 74.70.-b, 79.60.-i