2003/12/31 by Oleg Tchernyshyov, Hong Yao, R. Moessner
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.69.212402
published as Phys. Rev. B 69, 212402 (2004) · 4 pages, 2 EPS figures. Minor revision: clarifications in response to referee comments, additional references
arxiv created 2004/02/07 · arxiv updated 2009/12/01
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.