Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.34: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Polarization dependence of (Bi,Pb)-2201 and (Bi,Pb)-2212 low energy excitations by variable polarization ARPES — •Peter Hlawenka, Robin Weyrich, Aliakbar Ghafari, Christoph Janowitz, Helmut Dwelk, Alica Krapf, and Recardo Manzke — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Deutschland

The low energy excitations at the M-points of the four quadrants of the first Brillouin zone of superstructure free (Bi,Pb)-2201 and (Bi,Pb)-2212 single crystals have been investigated systematically with respect to their polarization dependence. A new spectrometer with a SCIENTA SES100 and HeI radiation from a duoplasmatron source was used. A polarizer with focusing capability enabled a continuous variation of the polarization vector in the CuO₂- plane. Like previously reported[1] the topmost emission consists of two peaks, whose relative intensity varies with the selected polarization and also the M-point under study, showing the M points to be essentially not equivalent. Possible reasons will be discussed taking also the results of temperature and photon energy dependent measurements into account.
R. Manzke, R. Müller, C. Janowitz, M. Schneider, A. Krapf, H. Dwelk; Phys. Rev. B 63, R100504 (2001)