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SUMMARY:Spin dynamics\, electronic nematicity and superconductivity in FeS
 e1-xSx: A strain tuning study
DTSTART;VALUE=DATE-TIME:20260401T023000Z
DTEND;VALUE=DATE-TIME:20260401T033000Z
DTSTAMP;VALUE=DATE-TIME:20260406T070700Z
UID:indico-event-4872@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Xingye Lu (鲁兴业) (Beijing Normal University)\n\
 nHost: Prof. Baiqing Lv  Venue: TDLI Meeting Room N600Tencent Meeting 
 link: https://meeting.tencent.com/dm/TZCenHqi6etAMeeting ID: 142534509\, 
 no password Abstract:The interplay between the electronic nematic state a
 nd superconductivity remains a central puzzle in iron-based superconductor
 s. In this talk\, I will present a comprehensive study of the spin dynamic
 s and pairing symmetry in detwinned FeSe1-xSx\, enabled by novel uniaxial 
 strain devices and Cryogenic Digital Image Correlation (CDIC). Using inela
 stic neutron and x-ray scattering\, we mapped the twin-free spin excitatio
 n spectrum\, revealing that highly anisotropic\, C2-symmetric stripe spin 
 excitations persist up to ~200 meV. These dispersive high-energy excitatio
 ns strongly suggest a local-moment\, spin-driven origin for the nematicity
 . Furthermore\, tracking these correlations across the nematic quantum cri
 tical point (NQCP) reveals that high-energy nematic spin fluctuations perv
 ade the entire phase diagram. Finally\, strain-tuning Tc reveals a sign re
 versal in the quadratic coefficient b across the NQCP\, indicating pairing
  symmetry evolves from s-wave in pure FeSe to a mixed s+d state at higher 
 doping. References:1.T. Chen\, X. Lu\, P. Dai et al\, Nat. Mater. 18\, 70
 9 (2019)\;2.X. Lu\, et al.\, Nat. Phys. 18\, 806 (2022)\;3.R. Liu\, X. Lu 
 et al.\, Phys. Rev. Lett. 132\, 016501 (2024)\;4.R. Liu\, X. Lu et al.\, N
 at. Commun. 16\, 5212 (2025)\;5.R. Liu\, X. Lu et al.\, Phys. Rev. B 112\,
  094514 (2025)\;6.R. Liu\, X. Lu et al.\, Chin. Phys. Lett. 41\, 067401 (2
 024).7.Z. Mo\, X. Lu et al.\, Chin. Phys. Lett. 41\, 107102 (2024)\; Biog
 raphy:Xingye Lu is a Professor and Doctoral Advisor at the School of Physi
 cs and Astronomy\, Beijing Normal University. He received his Ph.D. from t
 he Institute of Physics\, Chinese Academy of Sciences\, in 2014. From Nove
 mber 2014 to December 2016\, he conducted postdoctoral research at Rice Un
 iversity in the United States and the Swiss Light Source at the Paul Scher
 rer Institut (PSI) in Switzerland. He was also selected as a Marie Skłodo
 wska-Curie Actions-funded PSI Fellow (2015–2017). He has been a faculty 
 member at Beijing Normal University since 2017. His primary research focus
 es on neutron scattering and resonant inelastic X-ray scattering (RIXS) st
 udies of correlated electron materials. His systems of interest include ir
 on-based superconductors\, cuprate superconductors\, iridates\, and low-di
 mensional quantum magnetic materials. To date\, he has published 100 resea
 rch papers in prominent academic journals such as Science\, Nature sister 
 journals\, PRX\, PRL\, and PRB\, with over 4\,000 total citations.\n\nhttp
 s://indico-tdli.sjtu.edu.cn/event/4872/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4872/
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