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Anisotropic effect of a magnetic field on the neutron spin resonance in FeSe

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arxiv 2003.11488 v1 pith:3GOXGSZH submitted 2020-03-25 cond-mat.str-el

Tong Chen , Youzhe Chen , David W. Tam , Bin Gao , Yiming Qiu , Astrid Schneidewind , Igor Radelytskyi , Karel Prokes
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Songxue Chi Masaaki Matsuda Collin Broholm Pengcheng Dai
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classification cond-mat.str-el
keywords fieldresonancefeseneutronalignedanisotropiceffectmagnetic
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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.

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