Thermal Behaviors of Magnon Side-Bands in Antiferromagnets

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概要

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• The absorption coefficient for magnon side-bands is obtained in the whole temperature region by the two-time Green function method in the simple RPA description. The Hamiltonian is composed of excitons and spins, exciton operators being spin-dependent. It is shown that the magnon side-bands have the following behaviors. (1) For T∼0, only one band exists and its expression agrees with the result obtained by the simple spin wave approximation. (2) For 0<T<T_N. additional hot bands appear and the total intensity of absorption increases gradually as T increases. (3) For T∼T_N, all bands come together to from a single band at frequency ω=E_0 where E_0 is the orbital excitation energy. The total intensity is considerably temperature-dependent near and above T_N. (4) For T≫T_N, the total intensity tends to a constant value.

• 社団法人日本物理学会の論文
• 1971-08-05

著者

• Tanaka Hideho

  Department Of Chemistry Faculty Of Science Kyoto University

関連論文

• Longitudinal Spin Pair Correlation in Ferro- and Antiferromagnets with Uniaxial Anisotropy
• Thermal Behaviors of Magnon Side-Bands in Antiferromagnets

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