Abstract
The processes of magnetization of ferrimagnetic Heisenberg chains ofalternating spins are studied theoretically. Size-scaling analysiswith the exact diagonalization of finite systems for (S,s) = (3/2,1) and (2,1) indicates a multi-plateau structure in theground-state magnetization curve for S and s>1/2. The firstplateau in the spontaneous magnetization can be explainedclassically: as originating from the Ising gap. In contrast, thesecond and higher ones must be originating from the quantizationof the magnetization. It is also found that all of the 2splateaux, both classical and quantum ones, appear even in theisotropic case with no bond alternation.
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