Elementary excitations of Heisenberg ferrimagnetic spin chains

DOI DOI Web Site Web Site 被引用文献11件 オープンアクセス

書誌事項

公開日
1998-06-01
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevb.57.13610
  • 10.48550/arxiv.cond-mat/9710332
公開者
American Physical Society (APS)

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説明

We numerically investigate elementary excitations of the Heisenberg alternating-spin chains with two kinds of spins 1 and 1/2 antiferromagnetically coupled to each other. Employing a recently developed efficient Monte Carlo technique as well as an exact diagonalization method, we verify the spin-wave argument that the model exhibits two distinct excitations from the ground state which are gapless and gapped. The gapless branch shows a quadratic dispersion in the small-momentum region, which is of ferromagnetic type. With the intention of elucidating the physical mechanism of both excitations, we make a perturbation approach from the decoupled-dimer limit. The gapless branch is directly related to spin 1's, while the gapped branch originates from cooperation of the two kinds of spins.

7 pages, 7 Postscript figures, RevTex

収録刊行物

  • Physical Review B

    Physical Review B 57 (21), 13610-13616, 1998-06-01

    American Physical Society (APS)

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