Spin anisotropy of the resonance peak in superconducting FeSe&lt;sub&gt;0.5&lt;/sub&gt;Te&lt;sub&gt;0.5&lt;/sub&gt;

Babkevich, P.; Roessli, B.; Gvasaliya, S.N.; Regnault, L.P.; Freeman, P.G.; Pomjakushina, E.; Conder, K.; Boothroyd, A.T.

doi:10.1103/PhysRevB.83.180506

Spin anisotropy of the resonance peak in superconducting FeSe_0.5Te_0.5

Babkevich P, Roessli B, Gvasaliya SN, Regnault LP, Freeman PG, Pomjakushina E, Conder K & Boothroyd AT

Citation

Babkevich, P., Roessli, B., Gvasaliya, S. N., Regnault, L. P., Freeman, P. G., Pomjakushina, E., … Boothroyd, A. T. (2011). Spin anisotropy of the resonance peak in superconducting FeSe_0.5Te_0.5. Physical Review B, 83(18), R180506 (4 pp.). https://doi.org/10.1103/PhysRevB.83.180506

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:14185

We have used polarized-neutron inelastic scattering to resolve the spin fluctuations in superconducting FeSe_0.5Te_0.5 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^± symmetry, with a possible minority component of different symmetry.

Details

Publication Type

Journal Article

Title

Spin anisotropy of the resonance peak in superconducting FeSe_0.5Te_0.5

Author(s)

Babkevich, P. (3302 Neutron Spectroscopy)

Roessli, B. (3300 Neutron Scattering)

Gvasaliya, S.N. (3302 Neutron Spectroscopy)

Regnault, L.P.

Freeman, P.G.

Pomjakushina, E. (3602 Solid State Chemistry)