Critical Behavior of Anisotropic Heisenberg Mixed-Spin Chains in a Field

Details Critical Behavior of Anisotropic Heisenberg Mixed-Spin Chains in a Field Critical Behavior of Anisotropic Heisenberg Mixed-Spin Chains in a Field

1999-05-15

arxiv.org/abs/cond-mat/9905224v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, Revtex, with 7 eps figures, to appear in Phys. Rev. B (An extra ps figure (fig7.ps) is included for printing.)

Scientific paper

10.1103/PhysRevB.60.4053

We numerically investigate the critical behavior of the spin-(1,1/2) Heisenberg ferrimagnet with anisotropic exchange coupling in a magnetic field. A quantized magnetization plateau as a function of the field, appearing at a third of the saturated magnetization, is stable over whole the antiferromagnetic coupling region. The plateau vanishes in the ferromagnetic coupling region via the Kosterlitz-Thouless transition. Comparing the quantum and classical magnetization curves, we elucidate what are essential quantum effects.

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