A Low-Lying Magnon Resonant Mode in an Impure Heisenberg Ferromagnet

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概要

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• The effect of dilute impurity spins on the low-energy magnon spectrum of an impure Heisenberg ferromagnetic crystal lattice is studied with particular attention paid to the case in which each impurity spin is weakly (and ferromagnetically) exchange-coupled with its surrounding host spins. From a solution for one-impurity problem simple analytical expressions for the energy, the width and the localization of Γ_1-type virtual bound or resonant magnon mode is obtained using the effective-mass approximation for the evaluation of magnon Green's functions. It is shown that for such an impurity-host system the Γ_1-type magnon impurity mode is very likely to occur near the bottom of the magnon energy band. A brief discussion is given of the magnon specific heat at low temperatures.

• 理論物理学刊行会の論文
• 1968-09-25

著者

• Takeno Shozo

  Research Institute For Fundamental Physics Kyoto University

• Homma Sigeo

  Department Of Chemistry Faculty Of Science Kyoto University

• TAKENO Shozo

  Research Institute for Fundamental Physics, Kyoto University

• HOMMA Sigeo

  Department of Chemistry, Faculty of Science, Kyoto University

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