First order transition between magnetic order and valence-bond order in a 2D frustrated Heisenberg model
Condensed Matter
2009-10-28 v1
Abstract
We study the competition between magnetic order and valence bond order in a two dimensional (2D) frustrated Heisenberg model introduced some time ago by Shastry and Sutherland ({\sc B. Sriram Shastry} and {\sc Bill Sutherland}, {\em Physica} 108{\bf B},1069 (1981) ) for which a configuration of dimers is known to be the ground state in a certain range of parameters. Using exact diagonalisation of small clusters, linear spin wave theory and Schwinger boson mean field theory, we show that the transition between the two types of order is first-order, and that it takes place inside the domain where magnetic long-range order is stable with respect to quantum fluctuations.
Keywords
Cite
@article{arxiv.cond-mat/9507065,
title = {First order transition between magnetic order and valence-bond order in a 2D frustrated Heisenberg model},
author = {Marc Albrecht and Frederic Mila},
journal= {arXiv preprint arXiv:cond-mat/9507065},
year = {2009}
}
Comments
Revtex, 8 pages, 1 latex figure and 2 uuencoded postscript figures