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Chin. Phys. B, 2021, Vol. 30(12): 127402    DOI: 10.1088/1674-1056/ac3651
Special Issue: SPECIAL TOPIC — Unconventional superconductivity
SPECIAL TOPIC—Unconventional superconductivity Prev   Next  

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

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
Abstract  We report an inelastic neutron scattering investigation on the spin resonance mode in the optimally hole-doped iron-based superconductor Ba0.67K0.33Fe2As2 with 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.
Keywords:  iron-based superconductor      neutron spin resonance      magnetic excitations  
Received:  22 September 2021      Revised:  01 November 2021      Accepted manuscript online:  04 November 2021
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  75.30.Gw (Magnetic anisotropy)  
  78.70.Nx (Neutron inelastic scattering)  
Fund: 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).
Corresponding Authors:  Hui-Qian Luo     E-mail:  hqluo@iphy.ac.cn

Cite this article: 

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 Ba0.67K0.33Fe2As2 2021 Chin. Phys. B 30 127402

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