Order by disorder from non-magnetic impurities in a two-dimensional quantum spin liquid

Details Order by disorder from non-magnetic impurities in a two-dimensional quantum spin liquid Order by disorder from non-magnetic impurities in a two-dimensional quantum spin liquid

2000-07-13

arxiv.org/abs/cond-mat/0007228v1

Phys. Rev. Lett. 86, 1086 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.86.1086

We consider doping of non-magnetic impurities in the spin-1/2, 1/5-depleted square lattice. This structure, whose undoped phase diagram offers both magnetically ordered and spin-liquid ground states, is realized physically in CaV_4O_9. Doping into the ordered phase results in a progressive loss of order, which becomes complete at the percolation threshold. By contrast, non-magnetic impurities introduced in the spin liquids create a phase of weak but long-ranged antiferromagnetic order coexisting with the gapped state. The latter may be viewed as a true order-by-disorder phenomenon. We study the phase diagram of the doped system by computing the static susceptibility and staggered magnetization using a stochastic series-expansion quantum Monte Carlo technique.

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