Dispersion of neutron spin resonance mode in Ba_(0.67)K_(0.33)Fe_(2)As_(2)
作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100190China Laboratory for Neutron Scattering and ImagingPaul Scherrer InstitutCH-5232 Villigen PSISwitzerland Songshan Lake Materials LaboratoryDongguan 523808China
出 版 物：《Chinese Physics B》 (中国物理B（英文版）)
年 卷 期：2021年第30卷第12期
页 面：1-6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：Project supported by the National Key Research and Development Program of China(Grant Nos.2018YFA0704200,2018YFA0305602,2017YFA0303100,2017YFA0302900) the National Natural Science Foundation of China(Grant Nos.11822411 and 11961160699) the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(CAS)(Grant Nos.XDB25000000 and XDB07020300) K.C.Wong Education Foundation(Grant No.GJTD-2020-01) the Youth Innovation Promotion Association of CAS(Grant No.Y202001) the Beijing Natural Science Foundation,China(Grant No.JQ19002)
主 题：iron-based superconductor neutron spin resonance magnetic excitations
摘 要：We report an inelastic neutron scattering investigation on the spin resonance mode in the optimally hole-doped ironbased superconductor Ba_(0.67)K_(0.33)Fe_(2)As_(2)with T_c=38.2 *** the resonance is nearly two-dimensional with peak energy ER≈14 meV,it splits into two incommensurate peaks along the longitudinal direction([H,0,0])and shows an upward dispersion persisting to 26 *** dispersion breaks through the limit of total superconducting gaps△_(tot)=|△k|+|△k+Q|(about 11-17 meV)on nested Fermi surfaces measured by high resolution angle resolved photoemission spectroscopy(ARPES).These results cannot be fully understood by the magnetic exciton scenario under s^(±)-pairing symmetry of superconductivity,and suggest that the spin resonance may not be restricted by the superconducting gaps in the multi-band systems.
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