Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1
TT 25.11: Vortrag
Mittwoch, 25. März 2009, 12:15–12:30, HSZ 304
Comparison of ARPES and Raman spectra — •Wolfgang Prestel1, Bernhard Muschler1, Nathalie Munnikes1, Michael Lambacher1, Andreas Erb1, Yoichi Ando2, Shimpei Ono3, Toshizo Fujita2, Andrea Damascelli4, Hiroshi Eisaki5, Martin Greven6, and Rudi Hackl1 — 1Walther-Meissner-Institut, 85748 Garching — 2Osaka University, Osaka 567-0047, Japan — 3CRIEPI, Komae, Tokyo 201-8511, Japan — 4UBC, Vancouver, BC V6T 1Z4, Canada — 5AIST, Tsukuba 305-8568, Japan — 6Stanford University, Stanford, CA 94305, USA
Cuprate superconductors are strongly correlated metals. In the overdoped range the electrons can be described in terms of Landau quasiparticles. They manifest themselves as well defined peaks in the angle-resolved photoemission (ARPES) spectra. Using ARPES results we can quantitatively predict the normal state Raman spectra above a doping of p ≈ 0.21. For p < 0.21 we find discrepancies between simulation and experiment in the B1g channel becoming increasingly strong for decreasing p. At optimal doping we compare ARPES data and Raman measurements also in the superconducting state. Here we use an analytic expression which reproduces the ARPES data quantitatively in the entire Brillouin zone. Similarly as in the normal state, the B2g spectra are well reproduced, while there are discrepancies in B1g symmetry.
The project has been supported by the DFG under grant number Ha2071/3-4 via the Research Unit FOR538.