Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.29: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Berry curvature and orbital magnetization of the triplet superconductor Sr₂RuO₄ — •Martin Gradhad, James F. Annett, and Balazs L. Györffy — University of Bristol, H.H. Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, UK

The strong experimental evidence of spin triplet pairing in the superconducting phase of Sr₂RuO₄ prompts an interest in a detailed material dependent study of orbital magnetization in this exotic superconductor. [1] Evidently, the modern theory of orbital magnetization for metals, when generalized for the case of superconductors, would shed interesting light on the superconducting state which brakes time-reversal symmetry.

Here we present first principles as well as tight binding calculations of the Berry curvature in the normal state of Sr₂RuO₄ to show the reliability of the tight binding model. Since spin-orbit coupling is an essential ingredients of the problem a fully relativistic Greens-function method is applied to the calculation of the Berry curvature. [2] In a next step the tight binding model is used to describe the superconducting phase by solving the Bogolubov-de Gennes equation [3] and new contributions to the Berry curvature will be discussed.
Y. Maeno et al. Phys. Today 54 (1), 42 (2001)
M. Gradhand et al. Phys. Rev. B 84, 075113 (2011)
J.F. Annett et al. Phys. Rev. B 66, 134514 (2002)