Valence-bond crystal in a {111} slice of the pyrochlore antiferromagnet

Details Valence-bond crystal in a {111} slice of the pyrochlore antiferromagnet Valence-bond crystal in a {111} slice of the pyrochlore antiferromagnet

2003-12-04

arxiv.org/abs/cond-mat/0312141v2

Phys. Rev. B 69, 212402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 EPS figures. Minor revision: clarifications in response to referee comments, additional references

Scientific paper

10.1103/PhysRevB.69.212402

We investigate theoretically the ordering effect of quantum spin fluctuations in a Heisenberg antiferromagnet on a two-dimensional network of corner sharing tetrahedra. This network is obtained as a {111} slice of the highly frustrated pyrochlore lattice, from which it inherits the equivalence of all three pairs of opposite bonds of each tetrahedron. The lowest-order (in 1/S) quantum corrections partially lift the huge degeneracy of the classical ground state and select an ensemble of states with long-range valence-bond order.

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