Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.14: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Possibility of hole density modulation in highly overdoped Bi(Pb)-2201 single crystals: XAS measurements — •Ariffin Ahmad Kamal, Beate Müller, Rüdiger Mitdank, Lenart Dudy, Helmut Dwelk, Alica Krapf, Christoph Janowitz, and Recardo Manzke — Institut für Physik, Humboldt-Universität zu Berlin

The polarization i.e. angular dependence of the relative intensity of the satellite peak and the main peak of the CuL₃ edge of highly overdoped Bi(Pb)-2201 single crystals was studied by XAS. The spectrum near the CuL₃ edge displays the interaction of the Cu atom with the oxygen localized holes. The relative intensity of the satellite peak and the main peak, which gives the value and distribution of the hole content, has been measured by varying the angle of the electrical field vector E of the synchrotron light within the ab-plane. We have found that the relative intensity of the satellite peak and the white line of highly overdoped Bi(Pb)-2201 single crystals is polarization dependent. The modulation shows that the maximum occurs at nearly 60⁰ intervals. This suggests the hole density being distributed with some form of periodicity.