Critical exponents of the quantum phase transition in a planar antiferromagnet

Details Critical exponents of the quantum phase transition in a planar antiferromagnet Critical exponents of the quantum phase transition in a planar antiferromagnet

1997-02-10

arxiv.org/abs/cond-mat/9702077v2

J.Phys.Soc.Jap. 66 (1997) 2957-2960

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages including 4 figures; revised version: some minor changes and added references

Scientific paper

10.1143/JPSJ.66.2957

We have performed a large scale quantum Monte Carlo study of the quantum phase transition in a planar spin-1/2 Heisenberg antiferromagnet with CaV4O9 structure. We obtain a dynamical exponent z=1.018+/-0.02. The critical exponents beta, nu and eta agree within our errors with the classical 3D O(3) exponents, expected from a mapping to the nonlinear sigma model. This confirms the conjecture of Chubukov, Sachdev and Ye [Phys. Rev. B 49, 11919 (1994)] that the Berry phase terms in the planar Heisenberg antiferromagnet are dangerously irrelevant.

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