Low-Energy Spin Excitations in Detwinned FeSe

作     者：刘瑞鲜 Mitsutaka Nakamura Kazuya Kamazawa 鲁兴业 Ruixian Liu;Mitsutaka Nakamura;Kazuya Kamazawa;Xingye Lu

作者机构：Center for Advanced Quantum StudiesSchool of Physics and AstronomyBeijing Normal UniversityBeijing 100875China J-PARC CenterJapan Atomic Energy Agency(JAEA)TokaiIbaraki 319-1195Japan Research Center for Neutron Science and TechnologyComprehensive Research Organization for Science and SocietyTokaiIbaraki 319-1106Japan 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2024年第41卷第6期

页      面：112-118页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：Beijing Normal University was supported by the Fundamental Research Funds for the Central Universities the National Key Projects for Research and Development of China(No.2021YFA1400400) the National Natural Science Foundation of China(Grant Nos.12174029 and 11922402) the neutron beamtimes from J-PARC(Proposal No.2019A0002) 

主　　题：excitation symmetry slightly 

摘      要：Antiferromagnetic spin fluctuation is regarded as the leading driving force for electron pairing in high-Tc *** iron-based superconductors,spin excitations at low energy range,especially the spin-resonance mode at ER~5kBTc,are important for understanding the ***,we use inelastic neutron scattering(INS)to investigate the symmetry and in-plane wave-vector dependence of low-energy spin excitations in uniaxial-strain detwinned Fe *** low-energy spin excitations(E10 meV)appear mainly at Q=(±1,0)in the superconducting state(T9K)and the nematic state(T90 K),confirming the constant C_(2) rotational symmetry and ruling out the C_(4) mode at E≈3 meV reported in a prior INS ***,our results reveal an isotropic spin resonance in the superconducting state,which is consistent with the s±wave pairing *** slightly higher energy,low-energy spin excitations become highly *** full width at half maximum of spin excitations is elongated along the transverse *** Q-space isotropic spin resonance and highly anisotropic low-energy spin excitations could arise from dyz intra-orbital selective Fermi surface nesting between the hole pocket aroundΓpoint and the electron pockets centered at MX point.