Specific Heat of Quasi-One-Dimensional Spin 1/2 System CuNb2O6.

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  • Nishikawa Takashi
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Kato Masaya
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
  • Kanada Masaki
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
  • Fukamachi Toshihiko
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
  • Kodama Katsuaki
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Harashina Hiroshi
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)

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  • Specific Heat of Quasi-One-Dimensional
  • Specific Heat of Quasi-One-Dimensional Spin 1/2 System CuNb<sub><b>2</b></sub>O<sub><b>6</b></sub>

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Description

The specific heat C of CuNb2O6 with quasi-one-dimensional zig-zag spin S=1/2 chains has been measured in the temperature (T) range between 1.6, K and 40, K. For the orthorhombic phase, a sharp anomaly of C is observed at the antiferromagnetic transition temperature TN-- 7.3, K. The T-dependence of C of the monoclinic phase, whose ground state has a spin gap, can be well described by the exchange parameters determined by fitting the magnetic susceptibility χ calculated for a model of a ferromagnetic-antiferromagnetic alternating bond to the experimentally obtained χ . The gap-value estimated from the low temperature behavior of C is about 21, K, which is also consistent with the ones obtained by other measurements. Results of the measurements of the magnetic susceptibilities χ and the specific heats C of M--Cu1-xZnxNb2O6 (0≤ x≤ 0.5) and their structural parameters are also presented.

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