Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5

Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5

We have used polarized-neutron inelastic scattering to resolve the spin fluctuations in superconducting FeSe0.5Te0.5 into components parallel and perpendicular to the layers. A spin resonance at an energy of 6.5 meV is observed to develop below T_c in both fluctuation components. The resonance peak...

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Detalles Bibliográficos
Autores principales: Babkevich, P, Roessli, B, Gvasaliya, SN, Regnault, L, Freeman, P, Pomjakushina, E, Conder, K, Boothroyd, A
Formato: Journal article
Publicado: 2010
Descripción
Sumario:We have used polarized-neutron inelastic scattering to resolve the spin fluctuations in superconducting FeSe0.5Te0.5 into components parallel and perpendicular to the layers. A spin resonance at an energy of 6.5 meV is observed to develop below T_c in both fluctuation components. The resonance peak is anisotropic, with the in-plane component slightly larger than the out-of-plane component. Away from the resonance peak the magnetic fluctuations are isotropic in the energy range studied. The results are consistent with a dominant singlet pairing state with s^{\pm} symmetry, with a possible minority component of different symmetry.

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