Thermodynamic Properties of a Quantum Ferrimagnet Formed by an S = 1/2 Tetramer Chain

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概要

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• Specific heat measurements have been performed on a single crystal sample of the copper chain compound Cu(3-Clpy)_2(N_3)_2 which is regarded as the spin-1/2 ferromagnetic-ferromagnetic-antiferromagnetic-antiferromagnetic (F-F-AF-AF) tetramer chain. The temperature dependence of specific heat at zero magnetic field shows a gradual decrease upon cooling below about 6 K and reaches a finite value at low temperatures before showing a peak around 0.5 K. The latter behavior except the peak resembles that of the spin-1/2 Heisenberg ferromagnetic chain, which probably arises from the low lying excitation with a ferromagnetic feature in this system. Numerical calculation (exact diagonalization method) up to 12 spins of the specific heat for the spin-1/2 F-F-AF-AF Heisenberg chain reproduces this behavior and shows a tendency of the peak around 0.5 K. The origin of the peak and the specific heat in a magnetic field is discussed.

• 理論物理学刊行会の論文
• 2002-06-28

著者

• HAGIWARA Masayuki

  RIKEN (The Institute of Physical and Chemical Research)

• MINAMI Kazuhiko

  Graduate School of Mathematics, Nagoya University

• Aruga Katori

  Riken(inst. Physical And Chemical Res.) Saitama

• Aruga Katori

  Riken

• Aruga Katori

  Riken (the Institute Of Physical And Chemical Research)

• Minami Kazuhiko

  Graduate School Of Mathematics Nagoya University

• Hagiwara Masayuki

  Riken (the Institute Of Physical And Chemical Research):graduate School Of Integrated Science Yokoha

• HAGIWARA Masayuki

  RIKEN (The Institute of Physical and Chemical Research):Graduate School of Integrated Science, Yokohama City University

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