Ordering by Quantum Fluctuations in a Strongly Frustrated Heisenberg Antiferromagnet
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Physics
Quantum Physics
Quantum Physics
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The nature of the ordering of a quantum spin‐1/2 Heisenberg antiferromagnet is considered in the presence of the strong lattice frustration associated with the pyrochlore lattice. A field theory indicates that quantum fluctuations lead to a state having dimerization that has long‐range static correlations not in 〈S〉 but rather in 〈S(r)⋅S(r+δ)〉. A sublattice ordering is found that is consistent with results obtained using degenerate perturbation theory to analyze the ground‐state manifold.
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1991-04-15
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Journal of Applied Physics