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- W2034184811 abstract "Using some simple geometries composed solely of interconnecting 'diamonds', the authors study the competition between long-range magnetic order and quantum fluctuations. Since a four-atom 'diamond' is formed from two-edge sharing triangles, a 'diamond' is topologically frustrated, and hence magnetic order is energetically less favourable than usual. The classical limit yields a ferrimagnetic state with equally large ferromagnetic and antiferromagnetic moments. Symptomatic of the topological problems, there are some zero energy 'spin wave' modes in the classical limit. For low-spin systems these low energy modes become excited in the ground state, which has none of the properties predicted by the classical solution. For spin 1/2, the ground state has only short-range correlations, a broken translational symmetry, and a gap to localised spin-1/2 excitations, which also have a topological quantum number." @default.
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- W2034184811 date "1990-12-31" @default.
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- W2034184811 title "An exactly soluble two-dimensional quantum mechanical Heisenberg model: quantum fluctuations versus magnetic order" @default.
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- W2034184811 doi "https://doi.org/10.1088/0953-8984/2/51/007" @default.
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