Singlet-triplet dispersion reveals additional frustration in the triangular-lattice dimer compound Ba3Mn2O8

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 reveals nearest-neighbor and next-nearest-neighbor ferromagnetic interactions between adjacent bilayers that compete against e...

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Published inPhysical review letters Vol. 100; no. 23; p. 237201
Main Authors Stone, M B, Lumsden, M D, Chang, S, Samulon, E C, Batista, C D, Fisher, I R
Format Journal Article
LanguageEnglish
Published United States 13.06.2008
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Summary: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 reveals nearest-neighbor and next-nearest-neighbor ferromagnetic interactions between adjacent bilayers that compete against each other. Although the interbilayer exchange is comparable to the intrabilayer exchange, this additional frustration reduces the effective coupling along the c axis and leads to a quasi-two-dimensional behavior. In addition, the obtained exchange values are able to reproduce the four critical fields in the phase diagram.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.100.237201