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Phase Diagram of the 1/2-1/2-1-1 Spin Chain by the Nonlinear Sigma Model | | Ken’ichi Takano
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30 Sep 1999 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech | | Abstract: | 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. | | Source: | arXiv, cond-mat/9909440 | | Services: | Forum | Review | PDF | Favorites | |
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