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000643318 245__ $$aDiscovery of high-temperature charge order and time-reversal symmetry-breaking in the kagome superconductor YRu$_3$Si$_2$
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000643318 520__ $$aIdentifying 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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000643318 7001_ $$0P:(DE-H253)PIP1110343$$aGraham, Jennifer$$b1
000643318 7001_ $$00000-0002-7479-8348$$aSazgari, V.$$b2
000643318 7001_ $$0P:(DE-H253)PIP1087271$$aPlokhikh, I.$$b3
000643318 7001_ $$00009-0007-9272-7627$$aLukovkina, A.$$b4
000643318 7001_ $$0P:(DE-H253)PIP1097068$$aGerguri, O.$$b5
000643318 7001_ $$00000-0003-3431-6102$$aBiało, I.$$b6
000643318 7001_ $$aDoll, A.$$b7
000643318 7001_ $$0P:(DE-H253)PIP1093075$$aMartinelli, Leonardo$$b8
000643318 7001_ $$0P:(DE-H253)PIP1103231$$aOppliger, J.$$b9
000643318 7001_ $$0P:(DE-H253)PIP1023793$$aIslam, S. S.$$b10
000643318 7001_ $$00009-0002-1889-6071$$aSpitaler, M.$$b11
000643318 7001_ $$aWang, K.$$b12
000643318 7001_ $$aSalamin, M.$$b13
000643318 7001_ $$aLuetkens, H.$$b14
000643318 7001_ $$00000-0002-4768-5524$$aKhasanov, R.$$b15
000643318 7001_ $$0P:(DE-H253)PIP1001164$$aZimmermann, M. V.$$b16
000643318 7001_ $$aYin, J.-X.$$b17
000643318 7001_ $$00000-0001-7617-2886$$aWang, Ziqiang$$b18
000643318 7001_ $$aChang, J.$$b19
000643318 7001_ $$00000-0002-4233-4071$$aMonserrat, B.$$b20
000643318 7001_ $$00000-0003-4460-7106$$aGawryluk, D.$$b21
000643318 7001_ $$00000-0003-0422-6042$$avon Rohr, F. O.$$b22
000643318 7001_ $$0P:(DE-HGF)0$$aKim, S.-W.$$b23$$eCorresponding author
000643318 7001_ $$0P:(DE-H253)PIP1096271$$aGuguchia, Zurab$$b24$$eCorresponding author
000643318 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/s41467-025-67881-4$$gVol. 17, no. 1, p. 1121$$n1$$p1121$$tNature Communications$$v17$$x2041-1723$$yx
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