Low-temperature properties of quantum antiferromagnetic chains with alternating spins and

DOI DOI 被引用文献8件 オープンアクセス

書誌事項

公開日
1997-05-12
DOI
  • 10.1088/0953-8984/9/19/012
  • 10.48550/arxiv.cond-mat/9610109
公開者
IOP Publishing

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説明

We study the low-temperature properties of S=1 and 1/2 alternating spin chains with antiferromagnetic nearest-neighbor exchange couplings using analytical techniques as well as a quantum Monte Carlo method. The spin-wave approach predicts two different low-lying excitations, which are gapped and gapless, respectively. The structure of low-lying levels is also discussed by perturbation theory in the strength of the Ising anisotropy. These analytical findings are compared with the results of quantum Monte Carlo calculations and it turns out that spin-wave theory well describes the present system. We conclude that the quantum ferrimagnetic chain exhibits both ferromagnetic and antiferromagnetic aspects.

13 pages, RevTeX, six figures, submitted to J. Phys. Cond. Mat

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