Chen Tong, Chen Youzhe, Tam David W, Gao Bin, Qiu Yiming, Schneidewind Astrid, Radelytskyi Igor, Prokes Karel, Chi Songxue, Matsuda Masaaki, Broholm Collin, Dai Pengcheng
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev B. 2020;101(14). doi: 10.1103/physrevb.101.140504.
We use inelastic neutron scattering to study the effect of a magnetic field on the neutron spin resonance ( = 3.6 meV) of superconducting FeSe ( = 9 K). While a field aligned along the in-plane direction broadens and suppresses the resonance, a -axis aligned field does so much more efficiently, consistent with the anisotropic field-induced suppression of the superfluid density from the heat capacity measurements. These results suggest that the resonance in FeSe is associated with the superconducting electrons arising from orbital selective quasiparticle excitations between the hole and electron Fermi surfaces.
我们使用非弹性中子散射来研究磁场对超导FeSe（(T_c = 9) K）的中子自旋共振（(\omega = 3.6) meV）的影响。虽然沿面内方向排列的磁场会使共振变宽并抑制共振，但沿(c)轴排列的磁场抑制效果更显著，这与热容量测量中各向异性的场致超流密度抑制相一致。这些结果表明，FeSe中的共振与空穴和电子费米面之间轨道选择性准粒子激发产生的超导电子有关。
