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 in | Physical review letters Vol. 100; no. 23; p. 237201 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
13.06.2008
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Online Access | Get more information |
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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. |
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ISSN: | 0031-9007 |
DOI: | 10.1103/PhysRevLett.100.237201 |