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TT: Fachverband Tiefe Temperaturen

TT 29: Superconductivity: Mechanisms, Phase Diagram, Competing Order

TT 29.5: Talk

Thursday, February 28, 2008, 10:30–10:45, H 3010

Single-particle vs. two-particle properties in LSCO — •Wolfgang Prestel, Bernhard Muschler, Leonardo Tassini, Michael Lambacher, Andreas Erb, and Rudi Hackl — Walther-Meißner-Institute, Garching

On the overdoped side, high-T_c superconductors can be described as normal, though strongly correlated, metals. In order to explore the doping range in which the correlations become dominant, we compare single-particle properties as seen by ARPES and two-particle properties as measured by, e.g., Raman, dc and optical transport. To this end, we implement a phenomenological model for the electronic spectral function resembling ARPES data and calculate two-particle quantities using a generalized Kubo formula. On the overdoped side, the results of the model calculations agree to within 20 % with the experimental data including spectral and temperature dependences. Towards optimal doping the experimental B_1g Raman response is strongly suppressed in an energy range below 1000 cm⁻¹ in comparison to the spectra obtained from the model. This suppression is belived to originate from strong electronic correlations since it precedes the loss of spectral weight in the anti-nodal region found in ARPES experiments.

The project has been supported by the DFG under grant number Ha2071/3-2 via the Research Unit FOR538.