S = 1/2 Degrees of Freedom in Haldane System Y2BaNiO5 Observed by Submillimeter Wave ESR

Shojiro Kimura, Hitoshi Ohta, Mitsuhiro Motokawa, Tetsuya Yokoo, Jun Akimitsu

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22 Citations (Scopus)


We have performed submillimeter wave ESR measurement of Haldane system Y2BaNiO5 in the frequency region from 50 to 383 GHz using the pulsed magnetic field up to 16 T. Due to the excess oxygens, a few percent of Ni2+ ions of Y2BaNiO5, which we used, are substituted by the Ni3+ ion of which spin is S = 1/2. The ESR signals coming from the S = 1/2 degrees of freedom originated by the Ni3+ ion at the end of the finite chain, are observed at 4.2 K. The frequency-field relations of these ESR signals are analyzed by the model based on the VBS model, which is used in the case of Cu2+ doped NENP. The signs of the single ion anisotropies D and E are determined from the analysis.

Original languageEnglish
Pages (from-to)2514-2521
Number of pages8
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - Jul 1998
Externally publishedYes


  • Anisotropy
  • Haldane system
  • S=1/2 degrees of freedom
  • Submillimeter wave ESR
  • Ybanio

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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