Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$

M. B. Stone, M. D. Lumsden, S. Chang +3

We present single crystal inelastic neutron scattering measurements of the S=1 dimerized quasi-two-dimensional antiferromagnet Ba${}_3$Mn${}_2$O${}_8$. The singlet-triplet dispersion rev…