Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Unconventional Superconductors

TT 41.10: Talk

Wednesday, March 18, 2020, 17:45–18:00, HSZ 201

The source of spontaneous currents in BTRS superconductors — •V. Grinenko^1,2, S. Ghosh¹, R. Sarkar¹, F. Brückner¹, H. Luetkens³, K. Kihou⁴, C.H. Lee⁴, P. Chekhonin^1,2, W. Skrotzki¹, R. Hühne², K. Nielsch², S.-L. Drechsler², V.L. Vadimov⁵, M.A. Silaev⁶, P. Volkov^7,8, I. Eremin⁷, J. Park⁹, M.E. Barber⁹, N. Kikugawa¹⁰, D.A. Sokolov⁹, J.S. Bobowski^11,12, T. Miyoshi¹¹, Y. Maeno¹¹, A. P. Mackenzie^9,13, C. Hicks⁹, and H.-H. Klauss¹ — ¹TU Dresden — ²IFW Dresden — ³PSI, Switzerland — ⁴AIST, Japan — ⁵IPM, Russia — ⁶University of Jyväskylä, Finland — ⁷Ruhr-Universitat Bochum — ⁸Rutgers University — ⁹MPI CPFS — ¹⁰NIMS, Japan — ¹¹Kyoto University — ¹²University of British Columbia — ¹³University of St. Andrews

Recently, the superconductivity that breaks time-reversal symmetry (BTRS) attracts a lot of attention in the scientific community. However, there is no general agreement among the researches whether the evadible experimental data provide convincing support for the theoretical predictions. In particular, the nature of the spontaneous currents in the BTRS state remains mysterious. Here, we verify the proposal that spontaneous currents in the BTRS superconducting state appear due to spatial inhomogeneities of the superconducting order parameter. We study the effect of disorder on the strength of the spontaneous currents in the BTRS state in two superconducting systems: Sr₂RuO₄ and Ba_1−xK_xFe₂As₂. Our available data indicates that non-magnetic impurities indeed affect noticeably the strength of the spontaneous magnetization measured by muon spin rotation/relaxation technique.