Impurity-Bond Effect on the Spin-1 Antiferromagnetic Heisenberg Chain

Makoto Kaburagi, Isao Harada, Takashi Tonegawa

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Low-lying excited states of the spin-1 antiferromagnetic Heisenberg chain with an impurity bond are investigated in terms of domain-wall excitations by means of analytical methods as well as a method of numerical diagonalization. It is shown that 1) the impurity bond brings about a massive triplet mode in the Haldane gap, 2) the triplet state comprises three of the four ground states of an open chain, 3) the excited states with the domain wall trapped at the impurity bond, including the massive triplet mode, exhibit a Neel-type configuration of the magnetic moment around the impurity bond. On the basis of the present results, we propose a new energy versus magnetic-field diagram.

Original languageEnglish
Pages (from-to)1848-1852
Number of pages5
Journaljournal of the physical society of japan
Issue number6
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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