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TT: Tiefe Temperaturen

TT 9: Supraleitung: Eigenschaften, elektronische Struktur, Ordnungsparameter

TT 9.4: Talk

Tuesday, March 9, 2004, 10:30–10:45, H20

Photoemission and X-ray absorption study of La and Pb doped Bi-2201 — •M. Schneider, R. Mitdank, R.-St. Unger, T. Stemmler, R. Müller, H. Dwelk, C. Janowitz, A. Krapf, and R. Manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin

Besides to investigate the almost undisturbed CuO₂-plane of the cuprates, the additional advantage of the superconducting system Bi₂Sr_2−xLa_xCuO_6+δ and Bi_2−yPb_ySr_2−xLa_xCuO_6+δ is to cover the total doping range from the insulating up to the metallic phase by adjusting the La content. By additional substitution of some percentage of Bi by Pb in these samples also the structural about (5x1) superstructure of the BiO-planes is almost suppressed. We present a systematic photoemission (PES) and X-ray absorption (XAS) study of ceramic Bi-2201 samples for the entire doping range. Due to the determination of the density of states of both sides of the Fermi energy by PES and XAS, respectively, a model for the doping mechanism of the CuO₂-plane of the cuprates can be discussed.