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.
Unable to display preview. Download preview PDF.
- A.J. Arko, R.S. List, Z. Fisk, S.-W. Cheong, J.D. Tompson, J.A. O’Rourke, C.G. Olson, A.-B. Yang, T.W. Pi, J.L. Schirber, and N.D. Shin, J. Magn. Mater. Lett. 75, LI (1988)Google Scholar
- S. Ratz, N. Schroeder, R. Böttner, E. Dietz, U. Gerhardt, and Th. Wolf, preprint (1992)Google Scholar