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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 33.29: Poster

Wednesday, March 28, 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)

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