Quantum magnetization plateaux of an anisotropic ferrimagnetic spin chain

Details Quantum magnetization plateaux of an anisotropic ferrimagnetic spin chain Quantum magnetization plateaux of an anisotropic ferrimagnetic spin chain

2002-04-17

arxiv.org/abs/cond-mat/0204375v2

Physics

Condensed Matter

Statistical Mechanics

6 pages, Revtex, with 8 eps figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.214403

The magnetization curve of the $(S,s)=(1,1/2)$ ferrimagnetic alternating spin chain with the single-ion anisotropy $D$ is investigated with the numerical exact diagonalization of finite clusters and size-scaling analyses. The system has a plateau at 1/3 of the saturation moment, which corresponds to the spontaneous magnetization for D=0. Varying $D$ in the 1/3-magnetized ground state under the external field along the axis of $D$, a quantum phase transition is revealed to occur at the critical value $D/J=1.114 \pm 0.001$ where the plateau vanishes. Except for the critical point, the plateau is always opening, but the mechanism is different between $DD_c$. The change of mechanisms is an evidence to clarify that the plateau originates from the quantization of magnetization.

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