Journal Article

PUBDB-2026-00124

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Discovery of high-temperature charge order and time-reversal symmetry-breaking in the kagome superconductor YRu$_3$Si$_2$

Kral, P.Extern* ; Graham, J.Extern* ; Sazgari, V. ; Plokhikh, I.Extern* ; Lukovkina, A. ; Gerguri, O.Extern* ; Biało, I. ; Doll, A. ; Martinelli, L.Extern*XFEL.EU* ; Oppliger, J.Extern* ; Islam, S. S.Extern* ; Spitaler, M. ; Wang, K. ; Salamin, M. ; Luetkens, H. ; Khasanov, R. ; Zimmermann, M. V.DESY* ; Yin, J.-X. ; Wang, Z. ; Chang, J. ; Monserrat, B. ; Gawryluk, D. ; von Rohr, F. O. ; Kim, S.-W. (Corresponding author) ; Guguchia, Z. (Corresponding author)Extern*

2026
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-025-67881-4  doi:10.3204/PUBDB-2026-00124

Abstract: 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 YRu$_3$Si$_2$ 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, YRu$_3$Si$_2$ becomes superconducting below Tc = 3.4 K with either two full isotropic gaps or an anisotropic nodeless gap. These results establish YRu$_3$Si$_2$ as a prime platform for studying correlated kagome physics.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P21.1 (PETRA III)

Appears in the scientific report 2026

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