Magnetic structure and spin excitations in BaMn2Bi2

S. Calder; B. Saparov; H. B. Cao; J. L. Niedziela; M. D. Lumsden; A. S. Sefat; A. D. Christianson

doi:10.1103/PhysRevB.89.064417

Magnetic structure and spin excitations in BaMn2Bi2

Strongly Correlated Electrons 2014-10-31 v1 Superconductivity

Authors: S. Calder , B. Saparov , H. B. Cao , J. L. Niedziela , M. D. Lumsden , A. S. Sefat , A. D. Christianson

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Abstract

We present a single crystal neutron scattering study of BaMn2Bi2, a recently synthesized material with the same ThCr2Si2-type structure found in several Fe-based unconventional superconducting materials. We show long range magnetic order, in the form of a G-type antiferromagnetic structure, to exist up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering we observe a spin-gap of 16meV, with spin-waves extending up to 55 meV. We find these magnetic excitations to be well fit to a J1-J2-Jc Heisenberg model and present values for the exchange interactions. The spin wave spectrum appears to be unchanged by the 100 K structural phase transition.

Keywords

spin excitations in condensed matter frustrated magnetism magnetic structure

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@article{arxiv.1310.7317,
  title  = {Magnetic structure and spin excitations in BaMn2Bi2},
  author = {S. Calder and B. Saparov and H. B. Cao and J. L. Niedziela and M. D. Lumsden and A. S. Sefat and A. D. Christianson},
  journal= {arXiv preprint arXiv:1310.7317},
  year   = {2014}
}

Magnetic structure and spin excitations in BaMn2Bi2

Abstract

Keywords

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