Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.3: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Double Photoemission from LSCO and BiSCO — •Deborah Schneider¹, Robert Wallauer¹, Stefan Voss¹, Tobias Bauer¹, Birte Ulrich¹, Markus Waitz¹, Dawiet Haile¹, Till Jahnke¹, Götz Berner², Amit Kanigel³, Markus Schöffler⁴, Horst Schmidt-Böcking¹, and Reinhard Dörner¹ — ¹IKF, Universität Frankfurt — ²EP4, Universität Würzburg — ³Technion, Haifa, Israel — ⁴ALS, Berkeley, USA

We investigate the emission of two electrons by a single photon from LSCO and BiSCO surfaces. Photon energy used was between 20 and 40 eV. The experiment took place at Bessy, the synchrotron in Berlin (single bunch mode). The detection method [1] was a time of flight spectrometer with a position sensitive detector, so that we are able to calculate the full momentum of each electron.

The theory [2] predicts that the back to back correlation of Cooper pairs should be conserved in the final state. Therefore we expect to be able to distinguish the pairs from the isotropic background of scattered electron pairs. We will show a comparison of spectra obtained in the superconducting state and the normal state.

[1] M. Hattass et. al, Rev. Sci. Instr. 75, 2373 (2004)

[2] K. A. Kouzakov and J. Berakdar, Phys. Rev. Lett. 91, 257007 (2003)