S = 1 excitations in heat capacity of the Haldane compound TMNIN doped with a nonmagnetic impurity

Tatsuya Kawae; Masakazu Ito; Masaki Mito; Kazuyoshi Takeda

doi:10.1143/JPSJ.68.740

S = 1 excitations in heat capacity of the Haldane compound TMNIN doped with a nonmagnetic impurity

Tatsuya Kawae, Masakazu Ito, Masaki Mito, Kazuyoshi Takeda

Applied Physics

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Abstract

We have studied the field dependence of the heat capacity of a typical Haldane antiferromagnet (CH₃)₄NNi(NO)₃ (TMNIN) doped with the nonmagnetic impurity Zn²⁺, as well as of a pure TMNIN. The overall features of the magnetic heat capacity, including the characteristic broad maximum, are almost reproduced by the theoretical curve with J/k_B = -12K for both systems in zero field. The field dependence in the impure systems is described well by assuming the Schottky heat capacity with S = 1, not S = 1/2 expected from the VBS model. A possible reason why the S = 1 model is suitable is discussed.

Original language	English
Pages (from-to)	740-743
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	68
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.68.740
Publication status	Published - 1999

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All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Cite this

Kawae, T., Ito, M., Mito, M., & Takeda, K. (1999). S = 1 excitations in heat capacity of the Haldane compound TMNIN doped with a nonmagnetic impurity. Journal of the Physical Society of Japan, 68(3), 740-743. https://doi.org/10.1143/JPSJ.68.740

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abstract = "We have studied the field dependence of the heat capacity of a typical Haldane antiferromagnet (CH3)4NNi(NO)3 (TMNIN) doped with the nonmagnetic impurity Zn2+, as well as of a pure TMNIN. The overall features of the magnetic heat capacity, including the characteristic broad maximum, are almost reproduced by the theoretical curve with J/kB = -12K for both systems in zero field. The field dependence in the impure systems is described well by assuming the Schottky heat capacity with S = 1, not S = 1/2 expected from the VBS model. A possible reason why the S = 1 model is suitable is discussed.",

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AU - Kawae, Tatsuya

AU - Ito, Masakazu

AU - Mito, Masaki

AU - Takeda, Kazuyoshi

PY - 1999

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N2 - We have studied the field dependence of the heat capacity of a typical Haldane antiferromagnet (CH3)4NNi(NO)3 (TMNIN) doped with the nonmagnetic impurity Zn2+, as well as of a pure TMNIN. The overall features of the magnetic heat capacity, including the characteristic broad maximum, are almost reproduced by the theoretical curve with J/kB = -12K for both systems in zero field. The field dependence in the impure systems is described well by assuming the Schottky heat capacity with S = 1, not S = 1/2 expected from the VBS model. A possible reason why the S = 1 model is suitable is discussed.

AB - We have studied the field dependence of the heat capacity of a typical Haldane antiferromagnet (CH3)4NNi(NO)3 (TMNIN) doped with the nonmagnetic impurity Zn2+, as well as of a pure TMNIN. The overall features of the magnetic heat capacity, including the characteristic broad maximum, are almost reproduced by the theoretical curve with J/kB = -12K for both systems in zero field. The field dependence in the impure systems is described well by assuming the Schottky heat capacity with S = 1, not S = 1/2 expected from the VBS model. A possible reason why the S = 1 model is suitable is discussed.

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10.1143/JPSJ.68.740