Neutron scattering study of linear-chain Haldane compounds NDMAZ and NDMAP

N. Metoki, Y. Koike, Y. Matsuoka, T. Kobayashi, M. Yamashita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Neutron scattering experiments were carried out for the new Haldane compounds Ni(C5H14N2)2N 3(ClO4) (NDMAZ) and Ni(C5H14Nj) 2N3(PF6) (NDMAP) in the magnetic field up to 10T in order to investigate the field-induced long-range ordering and the spin excitation. For NDMAZ, the triplet excited state (1.61,1.76, and 3.2 meV) and field dependence of these levels were observed at Q = (000.5). From these data, the intra-chain coupling constant = 4.3 meV and the anisotropic parameters D = 0.76meV and |E| = 0.038 meV were estimated. For NDMAP the gap was observed at about 0.48 and 0.64 meV at Q = (000.5). By applying the field of 5 T, the first excited state shifted below the resolution less than 0.1.3 meV. Above the critical field Hc, the intensities of singlet-triplet excitation becomes very weak. This work is the first neutron scattering study on a Haldane system above the critical fields

Original languageEnglish
Pages (from-to)414-416
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART I
DOIs
Publication statusPublished - 2001

Keywords

  • Antiferromagnet-one-dimensional
  • Haldane gap
  • Haldane system
  • Neutron scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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