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Dispersion of neutron spin resonance mode in Ba_(0.67)K_(0.33)Fe_(2)As_(2)

Chinese Physics B 2021年第12期30卷 1-6页

作者： Tao Xie Chang Liu tom fennell Uwe Stuhr Shi-Liang Li Hui-Qian Luo Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Laboratory for Neutron Scattering and Imaging Paul Scherrer InstitutCH-5232 Villigen PSISwitzerland Songshan Lake Materials Laboratory Dongguan 523808China

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.

关键词： iron-based superconductor neutron spin resonance magnetic excitations

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Dispersion of neutron spin resonance mode in Ba0.67K0.33Fe2As2

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Chinese Physics B 2021年第12期30卷 605-610页

作者：谢涛刘畅 tom fennell Uwe Stuhr 李世亮罗会仟 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Neutron Scattering Division Oak Ridge National Laboratory Laboratory for Neutron Scattering and Imaging Paul Scherrer Institut Songshan Lake Materials Laboratory

We report an inelastic neutron scattering investigation on the spin resonance mode in the optimally hole-doped ironbased superconductor Ba0.67K0.33Fe2As2with Tc= 38.2 K. Although 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 meV. Such 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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