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

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  • Kobayashi Tatsuo
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560
  • Kohda Akihiro
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560
  • Amaya Kiichi
    Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560
  • Ito Masakazu
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Deguchi Hiroyuki
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Takeda Kazuyoshi
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Asano Takayuki
    Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910
  • Ajiro Yoshitami
    Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910
  • Mekata Mamoru
    Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910

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  • Low Temperature Thermal and Magnetic Pr

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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.

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