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TT: Fachverband Tiefe Temperaturen

TT 32: Focus Session: Chiral Topological Superconductors and Majorana Fermions

TT 32.1: Invited Talk

Tuesday, March 13, 2018, 09:30–10:00, H 0104

Spin-Triplet Superconductivity in the Ruthenate — •Yoshiteru Maeno — Department of Physics, Kyoto University, Kyoto, Japan

The superconducting symmetry of Sr2RuO4 has been widely recognized as spin-triplet, chiral p-wave, based on a number of experimental observations as well as theoretical examinations. Although there are unresolved issues to explain, such as the strong suppression of the upper critical field and the first-order transition for the in-plane magnetic fields, there does not seem to be an alternative spin-singlet scenario at present capable of explaining all the key experiments [1].

In this talk, some important facts to consider towards refining the proper spin-triplet scenario are presented, such as the multicomponent order parameter characteristics of the intrinsic "1.5-K phase". This talk also addresses the issue of topological superconductivity of Sr2RuO4. Depending on the direction of the Cooper-pair d-vector, spinfull Dirac electron edge modes or spinless Majorana edge modes are expected.

This talk is mainly based on the collaborations and discussions with S. Kashiwaya, M. Sato, C. Hicks, A.P. Mackenzie, S. Yonezawa, Y. Yasui, K. Lahabi, and J. Aarts.
A.P. Mackenzie et al., npj Quantum Materials (2017) 2:40.

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