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The magnetization curve of the $(S,s)=(1,1/2)$ ferrimagnetic alternating spinchain with the single-ion anisotropy $D$ is investigated with the numericalexact diagonalization of finite clusters and size-scaling analyses. The systemhas a plateau at 1/3 of the saturation moment, which corresponds to thespontaneous magnetization for D=0. Varying $D$ in the 1/3-magnetized groundstate under the external field along the axis of $D$, a quantum phasetransition 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 isalways opening, but the mechanism is different between $D<D_c$ and $D>D_c$. Thechange of mechanisms is an evidence to clarify that the plateau originates fromthe quantization of magnetization.Comment: 6 pages, Revtex, with 8 eps figures, to appear in Phys. Rev.

Quantum magnetization plateaux of an anisotropic ferrimagnetic spin chain