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Strong ferromagnetic exchange interaction under ambient pressure in BaFe2 S3

  • Author(s): Wang, M
  • Jin, SJ
  • Yi, M
  • Song, Y
  • Jiang, HC
  • Zhang, WL
  • Sun, HL
  • Luo, HQ
  • Christianson, AD
  • Bourret-Courchesne, E
  • Lee, DH
  • Yao, DX
  • Birgeneau, RJ
  • et al.
Abstract

Inelastic neutron scattering measurements have been performed to investigate the spin waves of the quasi-one-dimensional antiferromagnetic ladder compound BaFe2S3, where a superconducting transition was observed under pressure [H. Takahashi, Nat. Mater. 14, 1008 (2015)1476-112210.1038/nmat4351; T. Yamauchi, Phys. Rev. Lett. 115, 246402 (2015)PRLTAO0031-900710.1103/PhysRevLett.115.246402]. By fitting the spherically averaged experimental data collected on a powder sample to a Heisenberg Hamiltonian, we find that the one-dimensional antiferromagnetic ladder exhibits a strong nearest-neighbor ferromagnetic exchange interaction (SJR=-71±4 meV) along the rung direction, an antiferromagnetic SJL=49±3 meV along the leg direction, and a ferromagnetic SJ2=-15±2 meV along the diagonal direction. Our data demonstrate that the antiferromagnetic spin excitations are a common characteristic for the iron-based superconductors, while specific relative values for the exchange interactions do not appear to be unique for the parent states of the superconducting materials.

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