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

doi:10.1088/1674-1056/ac3651

中国物理B ›› 2021, Vol. 30 ›› Issue (12): 127402-127402.doi: 10.1088/1674-1056/ac3651

所属专题： SPECIAL TOPIC — Unconventional superconductivity

Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂

Tao Xie(谢涛)^1,2,†§, Chang Liu(刘畅)^1,2,†, Tom Fennell³, Uwe Stuhr³, Shi-Liang Li(李世亮)^1,2,4, and Hui-Qian Luo(罗会仟)^1,4,‡

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2021-09-22 修回日期:2021-11-01 接受日期:2021-11-04 出版日期:2021-11-15 发布日期:2021-12-01
通讯作者: Hui-Qian Luo E-mail:hqluo@iphy.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0704200, 2018YFA0305602, 2017YFA0303100, and 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), and the Beijing Natural Science Foundation, China (Grant No. JQ19002).

Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂

Tao Xie(谢涛)^1,2,†§, Chang Liu(刘畅)^1,2,†, Tom Fennell³, Uwe Stuhr³, Shi-Liang Li(李世亮)^1,2,4, and Hui-Qian Luo(罗会仟)^1,4,‡

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2021-09-22 Revised:2021-11-01 Accepted:2021-11-04 Online:2021-11-15 Published:2021-12-01
Contact: Hui-Qian Luo E-mail:hqluo@iphy.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0704200, 2018YFA0305602, 2017YFA0303100, and 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), and the Beijing Natural Science Foundation, China (Grant No. JQ19002).

摘要/Abstract

摘要： We report an inelastic neutron scattering investigation on the spin resonance mode in the optimally hole-doped iron-based superconductor Ba_0.67K_0.33Fe₂As₂ with T_c=38.2 K. Although the resonance is nearly two-dimensional with peak energy E_R≈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.

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

Abstract: We report an inelastic neutron scattering investigation on the spin resonance mode in the optimally hole-doped iron-based superconductor Ba_0.67K_0.33Fe₂As₂ with T_c=38.2 K. Although the resonance is nearly two-dimensional with peak energy E_R≈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.

Key words: iron-based superconductor, neutron spin resonance, magnetic excitations

中图分类号: (Pnictides and chalcogenides)

74.70.Xa

75.30.Gw (Magnetic anisotropy) 78.70.Nx (Neutron inelastic scattering)

Tao Xie(谢涛), Chang Liu(刘畅), Tom Fennell, Uwe Stuhr, Shi-Liang Li(李世亮), and Hui-Qian Luo(罗会仟). Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂[J]. 中国物理B, 2021, 30(12): 127402-127402.

Tao Xie(谢涛), Chang Liu(刘畅), Tom Fennell, Uwe Stuhr, Shi-Liang Li(李世亮), and Hui-Qian Luo(罗会仟). Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂[J]. Chin. Phys. B, 2021, 30(12): 127402-127402.

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Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂

Dispersion of neutron spin resonance mode in Ba_0.67K_0.33Fe₂As₂

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