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SUMMARY:Neutron spin resonance mode in iron-based superconductors
DTSTART:20261014T020000Z
DTEND:20261014T030000Z
DTSTAMP:20261015T211600Z
UID:indico-event-5356@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Huiqian Luo (罗会仟) (Institute of Physics\, Chin
 ese Academy of Sciences)\n\nHost: Prof. Vadim Grinenko  \nVenue: TDLI M
 eeting Room N400\nTencent Meeting link: https://meeting.tencent.com/dm/P9F
 ef5Su8A4T\nMeeting ID: 126412766\, no password\n \nAbstract:\nHigh-Tc cup
 rates and iron-based superconductors (FeSCs) are speculated to have a comm
 on pairing mechanism based on spin fluctuations mediated Cooper pairing. S
 uch picture is strongly supported by an extensively observed neutron spin 
 resonance mode in the superconducting state [1]. In this talk\, I would li
 ke to introduce our more than 10 year works on the spin resonance mode in 
 iron-based superconductors. In the bilayer compound CaKFe4As4 \, we revea
 l a splitting resonance with two different modes with odd and even L-symme
 tries  due to the bilayer coupling[2]\, which similar to the bilayer cupr
 ates like YBCO and Bi2212 [3]. In the 2D compound (Ca0.85La0.15)10(Pt3As8)
 (Fe2As2)5 \, a resonance-like feature above Tc are found to like the spin
  excitations in the pseudogap state of cuprates [4]. Our polarized neutron
  scattering analysis suggests that the resonance is universally c-axis pre
 ferred in most FeSCs[5]. More interestingly\, it is demonstrated that the 
 c-axis dependence of the resonance can be scaled with the distance between
  two adjacent Fe-As layers (d) with a threshold of d = 6.7 A [6]. The in-p
 lane dispersion of the resonance is very sensitive to the threshold [6-9].
  For example\, a downward dispersion of spin resonance is oberseved in sli
 ghtly overdoped Ba0.4K0.6Fe2As2 with d = 6.74 A [10]. The behaviors of th
 e spin resonance in FeSCs could be understood by a competing picture betwe
 en the magnetically driven intra- and interlayer pairings\, leading to a t
 unable and flexible superconductivity.\n  \nReferences：\n[1] Pengcheng
  Dai\, Rev. Mod. Phys. 87\, 855 (2015).\n[2] Tao Xie et al.\, Phys. Rev. L
 ett. 120\, 267003 (2018).\n[3] Y. Sidis et al.\,  C. R. Phys. 8\, 745 (20
 07).\n[4] Zezong Li\, Wenshan Hong\, et al. arXiv:2501.08687.\n[5] Chang L
 iu et al.\, Phys. Rev. Lett. 128\, 137003 (2022).\n[6] Wenshan Hong et al.
 \, Phys. Rev. B 107\, 224514 (2023).\n[7] Tao Xie et al.\, Chin. Phys. B 3
 0\, 127402 (2021).\n[8] M. G. Kim et al.\, Phys. Rev. Lett. 110\, 177002 (
 2013).\n[9] Wenshan Hong et al.\, Phys. Rev. Lett. 125\, 117002 (2020).\n[
 10]    Yang Li\, et al. Chin. Phys. Lett. 42\, 067405 (2025).\n \nBiog
 raphy:\nHuiqian Luo is a professor in condensed matter physics at the Inst
 itute of Physics\, Chinese Academy of Sciences. He graduated at the Beijin
 g Normal University in 2004\, and got his PhD degree at the Institute of P
 hysics\, Chinese Academy of Sciences (IOP\, CAS) in 2009. After that\, he 
 stayed at IOP\, CAS and became an assistant professor\, and an associate p
 rofessor in 2012\, then a full professor in 2022. His research interests f
 ocus on correlated electron materials such as iron-based superconductors\,
  copper-oxide superconductors\, heavy fermion compounds\; spin-ladder mate
 rials\, quantum spin liquid materials and magnetic topological materials\,
  etc. He has published about 200 research papers with more than 5000 citat
 ions.\n\nhttps://indico-tdli.sjtu.edu.cn/event/5356/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5356/
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