2008/01/31 by M. B. Stone, M. D. Lumsden, Yiming Qiu +5 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.134406
8 pages, 8 figures, Submitted to Physical Review B, Resubmited version
arxiv created 2008/02/20 · openalex publication_date 2008/04/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba3Mn2O8. 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. Comparison to coupled dimer models describe the dispersion and scattering intensity accurately and determine the exchange constants in Ba3Mn2O8. 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.