Neutron Scattering Study of Magnetic Excitations in the Spin S = 1 One-Dimensional Heisenberg Antiferromagnet Y2BaNiO5

Takehiro Sakaguchi, Kazuhisa Kakurai, Tetsuya Yokoo, Jun Akimitsu

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Magnetic excitations of the ideal one-dimensional, spin S = 1, antiferromagnet Y2BaNiO5 are studied by means of inelastic neutron scattering on single crystal sample. Our experimental results at low temperature indicate that Y2BaNiO5 can be regarded as the best isotropic Haldane-system sofar studied with the intrachain exchange energy J/kB = -24.1meV and the averaged gap Δ(T = 7K) = 8.5meV. Y2BaNiO5 exhibits a good magnetic one-dimensionality with the inter-/intrachain exchange ratio of |J′ / J| ≤ 10-4 and has only very small easy-axis and in-plane single ion anisotropy of |D/J| = 0.03 and |E/J| ∼ 0.01. In addition the temperature dependence of the Haldane gap Δ(T) and its damping rate was determined.

Original languageEnglish
Pages (from-to)3025-3031
Number of pages7
Journaljournal of the physical society of japan
Volume65
Issue number9
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

Keywords

  • Haldane system
  • Low-dimensional magnetism
  • Neutron scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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