Low Temperature Thermal and Magnetic Properties of Haldane-Gap Antiferromagnet TMNIN

Tatsuo Kobayashi, Akihiro Kohda, Kiichi Amaya

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Heat capacity and susceptibility measurements are performed down to 70 mK under magnetic fields in the Haldane-gap antiferromagnet (CH3)4NNi(NO2)3 (TMNIN). We have observed no magnetic long range order within our experimental range of the temperature down to 70 mK and the magnetic field up to 7 T. The heat capacity reflects the field dependence of the energy gap and show a broad anomaly above a critical field HC, which has been also observed in NENP. In the adiabatic magnetization measurement, the spin temperature shows a minimum around Hc.These results are interpreted as increasing of the energy gap above Hc which may suppress the expected long-range-ordering.

Original languageEnglish
Pages (from-to)1961-1966
Number of pages6
Journaljournal of the physical society of japan
Volume63
Issue number5
DOIs
Publication statusPublished - 1994

Keywords

  • Haldane gap
  • TMNIN
  • heat capacity
  • one-dimensional antiferromagnet

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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