本文研究了由交换作用耦合起来的有限长铁磁和反铁磁链组成的自旋系统。

The system of spins in a finite ferromagnetic-antiferromagnetic chain, coupled by exchange interaction, is investigated.

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其次，我们讨论了自旋为1的易磁化轴反铁磁海森堡链的量子相变。

Furthermore, the quantum phase transition in an easy-axis antiferromagnetic Heisenberg spin-1 chain is numerically studied.

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