Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Unconventional Superconductors
TT 22.1: Invited Talk
Wednesday, September 7, 2022, 15:00–15:30, H10
Evidence for orbital loop current magnetism in Sr2RuO4 — R. Fittipaldi1, R. Hartmann2, M.T. Mercaldo1, S. Komori3, A. Bjørlig4, W. Kyung5, Y. Yasui6, T. Miyoshi6, L.A.B. Olde Olthof3, C.M. Palomares Garcia3, V. Granata1, I. Keren7, W. Higemoto8, A. Suter7, T. Prokscha7, A. Romano1, C. Noce1, C. Kim5, Y. Maeno6, E. Scheer2, B. Kalisky4, J.W.A. Robinson3, M. Cuoco1, Z. Salman7, A. Vecchione1, and •A. Di Bernardo2 — 1CNR-SPIN, University of Salerno, Italy — 2University of Konstanz, Germany — 3University of Cambridge, UK — 4Bar-Ilan University, Israel — 5Seoul National University, South Korea — 6Kyoto University, Japan — 7Paul Scherrer Institute, Switzerland — 8Japan Atomic Energy Agency
A deeper understanding of the normal-state properties of Sr2RuO4 is crucial also to determine its superconducting state symmetry. Using low-energy muon spin rotation spectroscopy, we have found evidence for a new form of magnetism on the surface of Sr2RuO4 in its normal state. We detect weak static dipolar fields with a relatively high onset temperature above 50 K. The magnetism observed is not conventional, and we demonstrate that it arises due to orbital loop currents at the reconstructed Sr2RuO4 surface. Our results [1] set a reference for the observation of orbital loop current magnetism in other materials and shed light onto a new mechanism that can affect the superconducting state of Sr2RuO4.
[1] R. Fittipaldi et al., Nat. Commun. 12, 5792 (2021)