Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$

Abstract

We present powder inelastic neutron scattering measurements of the S=1 dimerized antiferromagnet Ba${}_3$Mn${}_2$O${}_8$. The $T=1.4$ K magnetic spectrum exhibits a spin-gap of $\Delta \approx 1.0$ 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 Ba${}_3$Mn${}_2$O${}_8$. 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.

arXiv comment8 pages, 8 figures, Submitted to Physical Review B, Resubmited version

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Cited by in corpus (17)

• Magnetic Cluster Excitations
• Magnetic excitations of the gapped quantum spin dimer antiferromagnet Sr${}_3$Cr${}_2$O${}_8$
• Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8
• Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Non-linear bond-operator theory and 1/d expansion for coupled-dimer magnets I: Paramagnetic phase
• Combining micro- and macroscopic probes to untangle single-ion and spatial exchange anisotropies in a $S=1$ quantum antiferromagnet
• Weakly coupled alternating $S=1/2$ chains in the distorted honeycomb lattice compound Na${}_2$Cu${}_2$TeO${}_6$
• Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4
• Magnetic Fluctuations and the Spin-Orbit Interaction in Mott Insulating CoO
• Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8
• Infrared phonons and specific heat in Ba3Cr2O8
• Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4
• Hysteresis behaviors of a spin-1 anisotropic Heisenberg model
• Heat capacity of the site-diluted spin dimer system Ba3(Mn1-xVx)2O8
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet
• Structural and magnetic properties in the quantum S=1/2 dimer systems Ba3(Cr1-xVx)2O8 with site disorder