Dispersive magnetic excitations in the S=1 antiferromagnet Ba3 Mn2 O8

M. B. Stone; M. D. Lumsden; Y. Qiu; E. C. Samulon; C. D. Batista; I. R. Fisher

doi:10.1103/PhysRevB.77.134406

Dispersive magnetic excitations in the S=1 antiferromagnet Ba3 Mn2 O8

M. B. Stone, M. D. Lumsden, Y. Qiu, E. C. Samulon, C. D. Batista, I. R. Fisher

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Abstract

We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba3 Mn2 O8. The T=1.4 K magnetic spectrum exhibits a spin gap of Δ 1.0 meV and a dispersive spectrum with a bandwidth of approximately 1.5 meV. A comparison to coupled dimer models accurately describes the dispersion and scattering intensity and determines the exchange constants in Ba3 Mn2 O8. The wave vector dependent scattering intensity confirms the proposed S=1 dimer bond. Temperature dependent measurements of the magnetic excitations indicate the presence of both singlet-triplet and thermally activated triplet-quintet excitations.

Original language	English
Article number	134406
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.77.134406
State	Published - Apr 2 2008

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abstract = "We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba3 Mn2 O8. The T=1.4 K magnetic spectrum exhibits a spin gap of Δ 1.0 meV and a dispersive spectrum with a bandwidth of approximately 1.5 meV. A comparison to coupled dimer models accurately describes the dispersion and scattering intensity and determines the exchange constants in Ba3 Mn2 O8. The wave vector dependent scattering intensity confirms the proposed S=1 dimer bond. Temperature dependent measurements of the magnetic excitations indicate the presence of both singlet-triplet and thermally activated triplet-quintet excitations.",

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AU - Stone, M. B.

AU - Lumsden, M. D.

AU - Qiu, Y.

AU - Samulon, E. C.

AU - Batista, C. D.

AU - Fisher, I. R.

PY - 2008/4/2

Y1 - 2008/4/2

N2 - We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba3 Mn2 O8. The T=1.4 K magnetic spectrum exhibits a spin gap of Δ 1.0 meV and a dispersive spectrum with a bandwidth of approximately 1.5 meV. A comparison to coupled dimer models accurately describes the dispersion and scattering intensity and determines the exchange constants in Ba3 Mn2 O8. The wave vector dependent scattering intensity confirms the proposed S=1 dimer bond. Temperature dependent measurements of the magnetic excitations indicate the presence of both singlet-triplet and thermally activated triplet-quintet excitations.

AB - We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba3 Mn2 O8. The T=1.4 K magnetic spectrum exhibits a spin gap of Δ 1.0 meV and a dispersive spectrum with a bandwidth of approximately 1.5 meV. A comparison to coupled dimer models accurately describes the dispersion and scattering intensity and determines the exchange constants in Ba3 Mn2 O8. The wave vector dependent scattering intensity confirms the proposed S=1 dimer bond. Temperature dependent measurements of the magnetic excitations indicate the presence of both singlet-triplet and thermally activated triplet-quintet excitations.

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DO - 10.1103/PhysRevB.77.134406

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

Dispersive magnetic excitations in the S=1 antiferromagnet Ba3 Mn2 O8

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