On the Behavior of Thermal Conductivity near the Magnetic Transition Point
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概要
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The anomaly of thermal conductivity at the magnetic transition point observed in certain magnetic crystals has been treated theoretically using the correlation function expression for the thermal conductivity. The heat conduction by the spin system is shown to be negligible in the vicinity of the transition point. The phonon thermal conductivity was studied when transition temperature is much smaller than the Debye temperature adopting a simple spin-phonon coupling derived by a consideration of the change of energy of the spin system caused by the strain due to a phonon. Processes involving creation and annihilation of a phonon as well as scattering have been considered, and the anomalous temperature dependence of thermal conductivity at the transition point was understood in terms of the critical scattering of phonons by critical fluctuations of the energy density of the spin system which is revealed in the specific heat of the spins. Cases withmore general types of the spin-phonon interaction are briefly discussed.
- 理論物理学刊行会の論文
- 1963-06-25
著者
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Kawasaki Kyozi
Department Of Applied Physics Faculty Of Engineering Nagoya University
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KAWASAKI Kyozi
Department of Applied Physics, Faculty of Engineering Nagoya University
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