Phase Diagram of the 1/2-1/2-1-1 Spin Chain by the Nonlinear Sigma Model

Details Phase Diagram of the 1/2-1/2-1-1 Spin Chain by the Nonlinear Sigma Model Phase Diagram of the 1/2-1/2-1-1 Spin Chain by the Nonlinear Sigma Model

1999-09-30

arxiv.org/abs/cond-mat/9909440v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 Postscript figures, Submitted to Physica B (Proceedings of the 22nd International Conference on Low temperature Phy

Scientific paper

10.1016/S0921-4526(99)02801-X

We examine a periodic mixed spin chain with spin magnitudes 1/2 and 1 which are arrayed as 1/2-1/2-1-1. The three independent parameters are ratios of the four exchange couplings. We determine phase boundaries in the parameter space by using the gapless condition which was previously derived by mapping a general inhomogeneous spin chain to the nonlinear sigma model. We find two gapless boundaries separating three disordered phases. The features of the phases are explained in terms of singlet clusters.

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