Numerical study of a two-dimensional quantum antiferromagnet with random ferromagnetic bonds

Anders W. Sandvik

Type: Article

Publication Date: 1994-12-01

Citations: 8

DOI: https://doi.org/10.1103/physrevb.50.15803

Abstract

A Monte Carlo method for finite-temperature studies of the two-dimensional quantum Heisenberg antiferromagnet with random ferromagnetic bonds is presented. The scheme is based on an approximation which allows for an analytic summation over the realizations of the randomness, thereby significantly alleviating the ``sign problem'' for this frustrated spin system. The approximation is shown to be very accurate for ferromagnetic bond concentrations of up to 10%. The effects of a low concentration of ferromagnetic bonds on the antiferromagnetism are discussed.

Locations

Physical review. B, Condensed matter - View
arXiv (Cornell University) - View - PDF
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