Effective action approach to a bi-layer frustrated antiferromagnet

Preprint

5 May 1995

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9505022

Abstract

A bi-layer quantum frustrated antiferromagnet is studied using an effective action approach. The action derived from the microscopical Hamiltonian has the form of the O(3) non-linear sigma model. It is solved in the mean field approximation with the ultraviolet cut off chosen to fit numerical results. The obtained phase diagram displays a decrease in the critical value of interlayer coupling with increase of in-plane frustration. The critical point for a single-layer frustrated antiferromagnet (the J1-J2 model) is estimated to be J_{2c} = 0.19 J_1.

Keywords

LAYER FRUSTRATED ANTIFERROMAGNET
EFFECTIVE ACTION
ACTION APPROACH
ACTION DERIVED
SIGMA MODEL
BI LAYER

All Related Versions

Version 1, 1995-05-05, ArXiv
Published version: Physical Review B, 52 (13), 9170.

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