Neutron Scattering Study on Spin Dynamics in Superconducting (Tl,Rb)2Fe4Se5

Abstract

We observed in superconducting (Tl,Rb)2Fe4Se5 spin-wave branches that span an energy range from 6.5 to 209 meV. Spin dynamics are successfully described by a Heisenberg localized spin model whose dominant in-plane interactions include only the nearest (J1 and J1') and next nearest neighbor (J2 and J2') exchange terms within and between the tetramer spin blocks, respectively. These experimentally determined exchange constants would crucially constrain the theoretical viewpoints on magnetism and superconductivity in the Fe-based materials.

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Cited by in corpus (3)

• Structure, magnetic order and excitations in the 245 family of Fe-based superconductors
• Optical conductivity of iron-based superconductors
• High-pressure single-crystal neutron scattering study of magnetic and Fe vacancy orders in (Tl,Rb)2Fe4Se5 superconductor