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Paper detail

Magnetic structure and spin excitations in BaMn2Bi2

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.

preprint2013arXivOpen access
S. CalderB. SaparovH. B. CaoJ. L. NiedzielaM. D. LumsdenA. S. SefatA. D. Christianson
cond-mat.supr-concond-mat.str-el
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S. CalderB. SaparovH. B. CaoJ. L. NiedzielaM. D. LumsdenA. S. SefatA. D. Christianson

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