March 2013

Journal

Neutron Scattering Study on spin dynamics in superconducting (TlRb)2Fe4Se5

By:
Chi, Songxue ; Ye, Feng ; Bao, Wei; Fang, Minghu; Wang, H.D.; Dong, C.H.; Savici, Andrei T; Granroth, Garrett E; Stone, Matthew B; Fishman, Randy S
Journal Name:
Physical Review B
Page Number:
100501
Volume:
87
Issue Number:
10
Publication Date:
March 2013
View DOI Listing:
https://doi.org/10.1103/PhysRevB.87.100501

Abstract

Spin dynamics in superconducting (Tl,Rb)2Fe4Se5 was investigated using the inelastic neutron scattering technique. Spin wave branches that span an energy range from 6.5 to 209 meV are success- fully described by a Heisenberg model whose dominant interactions include only the in-plane nearest (J1 and J0 1) and next nearest neighbor (J2 and J0 2) exchange terms within and between the tetramer spin blocks, respectively. These exchange constants, experimentally determined in this work, would crucially constrain the diverse theoretical viewpoints on magnetism and superconductivity in the Fe-based materials.