Supercurrent through grain boundaries in the presence of strong correlations

Details Supercurrent through grain boundaries in the presence of strong correlations Supercurrent through grain boundaries in the presence of strong correlations

2011-06-28

arxiv.org/abs/1106.5759v2

Phys. Rev. Lett. 108, 117002 (2012)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.108.117002

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 the high-$T_c$ cuprates. In this work we present an extension of the Gutzwiller projection approach to treat electronic correlations below as well as above half-filling consistently. We apply this method to investigate the critical current through grain boundaries with a wide range of misalignment angles for electron- and hole-doped systems. For the latter excellent agreement with experimental data is found. We further provide a detailed comparison to an analogous weak-coupling evaluation.

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