Field-Induced Long-Range Ordering in Haldane Gap System NDMAZ

Tatsuo C. Kobayashi, Hiroshi Tatewaki, Akihiro Koda, Kiichi Amaya, Yasuo Narumi, Koichi Kindo, Naoko Aizawa, Tomohiko Ishii, Masahiro Yamashita

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8 Citations (Scopus)


Field-induced long-range ordering is investigated by heat capacity and high-field magnetization measurements in Haldane gap system Ni(C5H14N2)2N3(ClO 4) (NDMAZ). In the high-field magnetization measurement along the crystal c-axis, the differential magnetization is found to reveal the characteristic peak corresponding to the phase transition to the ordered state. The magnetization increases as (H - HC)0.6at the lowest temperature. The phase boundary determined down to 44mK by the peak of the differential magnetization obeys TN ∼ (H - HC)0.45. Anisotropic phase diagram is similar to that of Ni(C5H14N2)2N3(PF 6) (NDMAP).

Original languageEnglish
Pages (from-to)813-817
Number of pages5
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - Mar 1 2001
Externally publishedYes


  • Haldane gap
  • Heat capacity
  • Long-range order
  • Magnetization

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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