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

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

2010-10-29

arxiv.org/abs/1010.6204v2

Phys. Rev. B 83, 180506(R) (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.83.180506

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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