Neutron scattering study of spin dynamics in superconducting (Tl,Rb) 2Fe4Se5

Songxue Chi, Feng Ye, Wei Bao, Minghu Fang, H. D. Wang, C. H. Dong, A. T. Savici, G. E. Granroth, M. B. Stone, R. S. Fishman

    Research output: Contribution to journalArticlepeer-review

    15 Scopus citations

    Abstract

    We observed in superconducting (Tl,Rb)2Fe4Se 5 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.

    Original languageEnglish
    Article number100501
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume87
    Issue number10
    DOIs
    StatePublished - Mar 4 2013

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