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Publication
Journal of the Physical Society of Japan
Paper
Order Parameter in Quantum Antiferromagnets
Abstract
We discuss the nature of symmetry breaking in quantum antiferromagnets. We show that published arguments concerning the order parameter for the 2d s=1/2 Heisenberg antiferromagnet have to be reconsidered. These had led to √3 and 1 for the ratior of the mean z-component of the staggered spin per particle mzs in an infinitesimal staggered field B, to the r.m.s. value m0 of mzs with B=0, in the thermodynamic limit. We give arguments which put doubt on both values. Also we prove r ≧ 1, given m0 ≠ 0. © 1989, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.