Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains

Details Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains

1999-05-21

arxiv.org/abs/cond-mat/9905311v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 9 figures embedded, to appear in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/11/26/318

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.

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