Anisotropy in spin excitations of FeSe
By inelastic neutron scattering measurements, we have discovered spin resonance and spin fluctuations in FeSe. It would be rather interesting to see if resonance mode and spin gap are anisotropic in FeSe and how it evolves across TS since it shows no static order but strong spin fluctuation in this compound. If FeSe is a nematic quantum-disordered paramagnet, strong anisotropy is expected since it is close to static ordering. The evolution of spin excitation anisotropy will demonstrate how superconductivity, nematicity and spin fluctuation interplay in FeSe and will provide a brand new understanding of iron-based superconductors.
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ZHAO Jun; ENDERLE Mechthild; J. T. Park; SHEN Yao; H. C. Walker; Qisi Wang and WO Hongliang. (2016). Anisotropy in spin excitations of FeSe. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-484
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