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Anisotropic Effect of a Magnetic Field on the Neutron Spin Resonance in FeSe



Tong Chen, Youzhe Chen, David W. Tam, Bin Gao, Yiming Qiu, Astrid Schneidewind, Igor Radelytskyi, Karel Prokes, Songxue Chi, Masaaki Matsuda, Collin L. Broholm, Pengcheng Dai


We use inelastic neutron scattering to study the effect of a magnetic field on the neutron spin resonance (Er = 3.6 meV) of superconducting FeSe (Tc = 9 K). While a field aligned along the in-plane direction broadens and suppresses the resonance, a c-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 quasi-particle excitations between the hole and electron Fermi surfaces.
Physical Review B


Iron superconductor, anisotropic effect, inelastic neutron scattering


Chen, T. , Chen, Y. , Tam, D. , Gao, B. , Qiu, Y. , Schneidewind, A. , Radelytskyi, I. , Prokes, K. , Chi, S. , Matsuda, M. , Broholm, C. and Dai, P. (2020), Anisotropic Effect of a Magnetic Field on the Neutron Spin Resonance in FeSe, Physical Review B, [online], (Accessed May 24, 2024)


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Created April 15, 2020, Updated October 12, 2021