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

Abstract

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.

arXiv commentTo be published as a Rapid Communication in Physical Review B

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Cited by in corpus (2)

• Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe${}_2$
• Sinusoidal magnetic field induced topological excitations in a spin-orbit coupled spinor condensate