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Time Reversal Symmetry Breaking Superconductors: Sr2RuO4 and Beyond

Institute of Physics, M. Curie-Skłodowska University, ul. Radziszewskiego 10, 20-031 Lublin, Poland
Condens. Matter 2019, 4(2), 47; https://doi.org/10.3390/condmat4020047
Received: 9 March 2019 / Revised: 23 April 2019 / Accepted: 6 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
Recent work done on the time reversal symmetry (TRS) breaking superconductors is reviewed in this paper. The special attention is paid to Sr 2 RuO 4 believed to be spin triplet chiral p-wave superconductor which break TRS and is expected to posses non-trivial topological properties. The family of TRS breaking superconductors is growing relatively fast, with many of its newly discovered members being non-centrosymmetric. However not only Sr 2 RuO 4 but also many other superconductors which possess center of inversion also break TRS. The TRS is often identified by means of the muon spin relaxation ( μ SR) and the Kerr effect. Both methods effectively measure the appearance of the spontaneous bulk magnetic field below superconducting transition temperature. This compound provides an example of the material whose many band, multi-condensate modeling has enjoyed a number of successes, but the full understanding has not been achieved yet. We discuss in some details the properties of the material. Among them is the Kerr effect and by understanding has resulted in the discovery of the novel mechanism of the phenomenon. The mechanism is universal and thus applicable to all systems with multi-orbital character of states at the Fermi energy. View Full-Text
Keywords: time reversal symmetry breaking; spin triplet superconductivity; chiral order parameter; polar Kerr effect time reversal symmetry breaking; spin triplet superconductivity; chiral order parameter; polar Kerr effect
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Wysokiński, K.I. Time Reversal Symmetry Breaking Superconductors: Sr2RuO4 and Beyond. Condens. Matter 2019, 4, 47.

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