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

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, exists up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering, we observe a spin gap of 16 meV, with spin waves extending up to 55 meV. We find these magnetic excitations are 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.

Original language	English
Article number	064417
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.89.064417
State	Published - Feb 19 2014

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title = "Magnetic structure and spin excitations in BaMn2Bi2",

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, exists up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering, we observe a spin gap of 16 meV, with spin waves extending up to 55 meV. We find these magnetic excitations are 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.",

author = "S. Calder and B. Saparov and Cao, {H. B.} and Niedziela, {J. L.} and Lumsden, {M. D.} and Sefat, {A. S.} and Christianson, {A. D.}",

year = "2014",

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doi = "10.1103/PhysRevB.89.064417",

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T1 - Magnetic structure and spin excitations in BaMn2Bi2

AU - Calder, S.

AU - Saparov, B.

AU - Cao, H. B.

AU - Niedziela, J. L.

AU - Lumsden, M. D.

AU - Sefat, A. S.

AU - Christianson, A. D.

PY - 2014/2/19

Y1 - 2014/2/19

N2 - 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, exists up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering, we observe a spin gap of 16 meV, with spin waves extending up to 55 meV. We find these magnetic excitations are 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.

AB - 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, exists up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering, we observe a spin gap of 16 meV, with spin waves extending up to 55 meV. We find these magnetic excitations are 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.

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U2 - 10.1103/PhysRevB.89.064417

DO - 10.1103/PhysRevB.89.064417

M3 - Article

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VL - 89

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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M1 - 064417

ER -

Magnetic structure and spin excitations in BaMn₂Bi₂

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