Discovery of high-temperature charge order and time-reversal symmetry-breaking in the kagome superconductor YRu3Si2

Article Article scientifique Article Discovery of high-temperature charge order and time-reversal symmetry-breaking in the kagome superconductor YRu3Si2 eng 2025-12-21 author Král P 0000-0003-0126-2662 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Graham J N 0000-0002-3593-2479 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Sazgari V 0000-0002-7479-8348 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Plokhikh I 0000-0003-1638-2771 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland.,TU Dortmund University, Department of Physics, Dortmund, Germany. author Lukovkina Anastasiia 0009-0007-9272-7627 Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland. 402397 Département de physique de la matière quantique (FIMAC) author Gerguri O PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Biało I 0000-0003-3431-6102 Physik-Institut, Universität Zürich, Zürich, Switzerland. author Doll A 0000-0002-5957-424X PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Martinelli L 0000-0003-4978-8006 Physik-Institut, Universität Zürich, Zürich, Switzerland. author Oppliger J Physik-Institut, Universität Zürich, Zürich, Switzerland. author Islam S S PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Spitaler M 0009-0002-1889-6071 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Wang K 0000-0002-0120-0552 Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK. author Salamin Malo Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland. 937645 author Luetkens H 0000-0002-5842-9788 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Khasanov R 0000-0002-4768-5524 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author Zimmermann M V 0000-0002-9320-6846 Deutsches Elektronen-Synchrotron, Hamburg, Germany. author Yin J-X Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong, China. author Wang Ziqiang 0000-0001-7617-2886 Department of Physics, Boston College, Chestnut Hill, MA, USA. author Chang J 0000-0002-4655-1516 Physik-Institut, Universität Zürich, Zürich, Switzerland. author Monserrat B 0000-0002-4233-4071 Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK. author Gawryluk D 0000-0003-4460-7106 PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. author von Rohr Fabian 0000-0003-0422-6042 Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland. 973176 Département de physique de la matière quantique (FIMAC) Fabian Oliver Von Rohr author Kim S-W 0000-0002-5185-5119 Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK. swk38@cam.ac.uk. author Guguchia Z 0000-0002-5498-328X PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. zurab.guguchia@psi.ch. 1121 10.1038/s41467-025-67881-4 41423635 2041-1723 PMC12855824 https://www.nature.com/articles/s41467-025-67881-4 Identifying high-temperature unconventional charge order and superconductivity in kagome systems is crucial for understanding frustrated, correlated electrons and enabling future quantum technologies. Here, we report that the kagome superconductor YRu3 Si2 hosts an exceptional interplay of charge order, magnetism, and superconductivity, revealed through a comprehensive suite of muon spin rotation (μSR), magnetotransport, X-ray diffraction, and density functional theory (DFT). We identify a high-temperature charge-ordered state with propagation vector (1/2,0,0) and a record onset temperature of 800 K, unprecedented in kagome systems and quantum materials more broadly. μSR measurements further reveal time-reversal symmetry-breaking below 25 K and field-induced magnetism near 90 K, features mirrored in the magnetoresistance, which reaches 45% at low temperatures. Band-structure calculations show two van Hove singularities near the Fermi level, including one within a flat band. At low temperatures, YRu3 Si2 becomes superconducting below Tc = 3.4 K with either two full isotropic gaps or an anisotropic nodeless gap. These results establish YRu3 Si2 as a prime platform for studying correlated kagome physics. Dewey 500.2 Swiss National Science Foundation Unconventional correlated quantum phases of layered materials 211750 CH 33 Département de physique de la matière quantique 131 false 1383 Groupe von Rohr Nature communications 17 1 55ec47df-a772-4659-92ab-8945ca4169cf Article (Published version) Public Article_scientifique_from_crossref.pdf 4107648 application/pdf CC BY-NC-ND-4.0 8de95438390bcbb4dcde6ed0581a763e3e439ffc397de741874744a4229255e3 openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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