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SUMMARY:Time-reversal symmetry-breaking charge order in a kagome supercond
 uctor
DTSTART;VALUE=DATE-TIME:20220829T124000Z
DTEND;VALUE=DATE-TIME:20220829T130000Z
DTSTAMP;VALUE=DATE-TIME:20220826T105756Z
UID:indico-contribution-3653@indico.stfc.ac.uk
DESCRIPTION:Speakers: Zurab Guguchia (Laboratory for Muon Spin Spectroscop
 y\, Paul Scherrer Institute\, Switzerland)\nThe kagome lattice\, the most 
 prominent structural motif in quantum physics\, benefits from inherent non
 trivial geometry to host diverse quantum phases\, ranging from spin-liquid
  phases\, topological matter to intertwined orders\, and most rarely uncon
 ventional superconductivity. Recently\, charge sensitive probes have sugge
 sted that the kagome superconductors AV3Sb5 (A = K\, Rb\, Cs) [1] exhibit 
 unconventional chiral charge order. However\, direct evidence for the time
 -reversal symmetry-breaking of the charge order remained elusive. We utili
 zed muon spin relaxation to probe the kagome charge order and superconduct
 ivity in (K\,Rb)V3Sb5 [2\,3]. We observe a striking enhancement of the int
 ernal field width sensed by the muon ensemble\, which takes place just bel
 ow the charge ordering temperature and persists into the superconducting s
 tate. Remarkably\, the muon spin relaxation rate below the charge ordering
  temperature is substantially enhanced by applying an external magnetic fi
 eld. We further show [3] that the superconducting state displays a reduced
  superfluid density\, which can be attributed to the competition with the 
 novel charge order. Upon applying pressure\, the charge-order transitions 
 are suppressed\, the superfluid density increases\, and the superconductin
 g state progressively evolves from nodal to nodeless. Our results point to
  the rich interplay and accessible tunability between unconventional super
 conductivity and time-reversal symmetry-breaking charge orders in the corr
 elated kagome lattice\, offering new insights into the microscopic mechani
 sms involved in both orders.\n\n[1] Y.-X. Jiang et. al.\, Nature Materials
  20\, 1353 (2021). \n[2] C. Mielke et. al.\, and Z. Guguchia\, Nature 602\
 , 245-250 (2022).\n[3] Z. Guguchia et. al.\, arXiv:2202.07713v1 (2022).\n\
 nhttps://indico.stfc.ac.uk/event/53/contributions/3653/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3653/
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