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TT: Tiefe Temperaturen

TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)

TT 6.35: Poster

Montag, 24. März 2003, 14:30–19:00, P2c, P2d

Electronic structure of Pb-doped Bi-2201 cuprates — •R.-S. Unger¹, T. Stemmler¹, H. Dwelk¹, A. Krapf¹, S. Rogaschewski¹, C. Jannowitz¹, R. Manzke¹, C. Ast², and H. Hoechst² — ¹Institut fuer Physik, Humboldt-Universitaet zu Berlin, Invalidenstr. 110, 10115 Berlin — ²Synchrotron Radiation Center, 3731 Schneider Drive, Stoughton, WI 53589, U.S.A.

We present high-resolution photoemission data of Pb-doped Bi_2−yPb_ySr_2−xLa_xCuO_6+δ single crystals. The structural approximate (5x1) superstructure of the BiO-planes is almost completely suppressed in spectra what was also confirmed by LEED. We used a polarization of the synchrotron radiation of 22 eV photon energy parallel to the (0,0)-(π,0) direction and determined the Fermi surface of lightly overdoped Bi-2201(n=1) superconductors in the normal state at T=35 K. In comparison to published results of n=2 single crystals we observe only one hole-like Fermi surface. Our experimental Fermi surface of Bi-2201 will be compared in detail with results of Bi-2212 what is of great importance for the current discussion of the bi-layer splitting of n=2. Supported by the DFG (MA2371/1-3).