Umbrella-coplanar transition in the triangular XXZ model with arbitrary spin
Abstract
The quantum triangular XXZ model has recently enjoyed a wealth of new theoretical results, especially in relation to the modeling of the BaCoSbO compound. In particular, it has been understood that in a longitudinal magnetic field the umbrella (cone) phase, classically stable in all the easy-plane region of the ground-state phase diagram, is considerably reduced by the effect of quantum fluctuations. We provide more quantitative information for this phenomenon at arbitrary value of the site spin , by employing the dilute Bose gas expansion, valid in the high-field regime; our results improve the available estimates of the expansion. We quantify the extent to which a higher spin suppresses the effect of quantum fluctuations. Besides, we show how in three-dimensional layered systems a relatively small antiferromagnetic interlayer coupling has a similar consequence of bringing back the umbrella phase in some part of the phase diagram.
Cite
@article{arxiv.1510.07969,
title = {Umbrella-coplanar transition in the triangular XXZ model with arbitrary spin},
author = {Giacomo Marmorini and Daisuke Yamamoto and Ippei Danshita},
journal= {arXiv preprint arXiv:1510.07969},
year = {2016}
}
Comments
8 pages, 7 figures; v2 results unchanged, title and abstract slightly modified, introduction expanded, presentation generally improved, references added, matches published version