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

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

2008-01-15

arxiv.org/abs/0801.2332v2

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.77.134406

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.

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