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

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arxiv 1010.6204 v2 pith:GBM2BQL5 submitted 2010-10-29 cond-mat.supr-con

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

P. Babkevich , B. Roessli , S. N. Gvasaliya , L.-P. Regnault , P. G. Freeman , E. Pomjakushina , K. Conder , A. T. Boothroyd This is my paper
classification cond-mat.supr-con
keywords resonancecomponentspincomponentsenergyfese0fluctuationspeak
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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