Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions
Abstract
We investigate quantum phase transitions among the spin-gap phases and the magnetically ordered phases in a two-dimensional frustrated antiferromagnetic spin system, which interpolates several important models such as the orthogonal-dimer model as well as the model on the 1/5-depleted square lattice. By computing the ground state energy, the staggered susceptibility and the spin gap by means of the series expansion method, we determine the ground-state phase diagram and discuss the role of geometrical frustration. In particular, it is found that a RVB-type spin-gap phase proposed recently for the orthogonal-dimer system is adiabatically connected to the plaquette phase known for the 1/5-depleted square-lattice model.
Cite
@article{arxiv.cond-mat/0103264,
title = {Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions},
author = {Yoshihiro Takushima and Akihisa Koga and Norio Kawakami},
journal= {arXiv preprint arXiv:cond-mat/0103264},
year = {2009}
}
Comments
6 pages, to appear in JPSJ 70 (2001)