Anisotropy of the (π, π) dynamic susceptibility in magnetically ordered (x=0.05) and superconducting (x=0.40) Fe1.02Te1-xSex

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • K. Prokea
  • A. Hiess
  • E. Wheeler
  • S. Landsgesell
  • D. N. Argyriou

Detail(s)

Original languageEnglish
Article number064503
Journal / PublicationPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number6
Publication statusPublished - 1 Aug 2012
Externally publishedYes

Abstract

Polarized inelastic neutron scattering on magnetically ordered Fe1.02Te0.95Se0.05 and superconducting Fe1.02Te0.60Se0.40 has been used to elucidate the anisotropy of the magnetic dynamical susceptibility at or near the (π, π) momentum space position. By investigating Fe1.02Te0.60Se 0.40 in its superconducting state at 2 K, where a spin resonance at about 6 meV has been reported, we show that the susceptibility in the direction perpendicular to the c axis is by about 35% larger than for the direction along the c axis suggesting dominant singlet pairing of s ± type. At higher temperatures the same type of anisotropy is present in the spin dynamics of the normal state. On the other hand, for the Fe1.02Te0.95Se0.05 sample we find an almost isotropic response in the paramagnetic state. When the compound is magnetically ordered at (π, 0), the response near (π, π) persists, but with reduced intensity. The c-axis component is only slightly reduced whereas the in-plane component appears to be strongly reduced, leading to reverted anisotropy with respect to the superconducting compound. 

Citation Format(s)

Anisotropy of the (π, π) dynamic susceptibility in magnetically ordered (x=0.05) and superconducting (x=0.40) Fe1.02Te1-xSex. / Prokea, K.; Hiess, A.; Bao, W. et al.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 6, 064503, 01.08.2012.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review