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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1

TT 25.11: Talk

Wednesday, March 25, 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 B_1g 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 B_2g spectra are well reproduced, while there are discrepancies in B_1g symmetry.

The project has been supported by the DFG under grant number Ha2071/3-4 via the Research Unit FOR538.