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Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains | | Shoji Yamamoto
; Toru Sakai
; | | Date: |
21 May 1999 | | Subject: | Statistical Mechanics; Strongly Correlated Electrons | cond-mat.stat-mech cond-mat.str-el | | Abstract: | We discuss the critical behavior of the spin-(1,1/2) Heisenberg ferrimagnetic chain in a magnetic field, whose magnetization curve exhibits a plateau at a third of the full magnetization. A bond alternation stabilizes the massive state, whereas an exchange anisotropy causes the breakdown of the plateau and the onset of a gapless spin-fluid state, where the transition, lying in the XY but ferromagnetic region, is of Kosterlitz-Thouless type. In order to elucidate significant quantum effects, we investigate the model of classical version as well. | | Source: | arXiv, cond-mat/9905311 | | Services: | Forum | Review | PDF | Favorites | |
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