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TT: Fachverband Tiefe Temperaturen
TT 50: Superconductivity: (General) Theory
TT 50.10: Vortrag
Freitag, 30. März 2012, 12:00–12:15, H 3010
Supercurrent through cuprate grain boundaries in the presence of strong correlations — •Fabian Alexander Wolf, Siegfried Graser, Florian Loder, and Thilo Kopp — Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
Strong correlations are known to severely reduce the mobility of charge carriers near half-filling and thus have an important influence on the current carrying properties of grain boundaries in high-Tc cuprates. We apply a Gutzwiller method to investigate the critical current through microscopically reconstructed grain boundaries for a wide range of misalignment angles. In good agreement with experimental data, we find a reduction of the current by one order of magnitude as compared to an analogous weak coupling evaluation. This reduction emerges from the interplay of charge fluctuations and strong correlations. See Reference arXiv:1106.5759.