Effect of Electron-Phonon Interaction on Magnon Energy in Itinerant Electron Ferromagnet

概要

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A dynamical transverse spin susceptibility is calculated in the random phase approximation on the Hubbard model including the electron-phonon interaction for the system of d-electrons and phonons. The magnon energy and its life time in the long wavelength wavelength are obtained up to the second order terms with respect to the coupling constant in the electron-phonon interaction. It is shown that the shift of the exchange stiffness constant due to phonons is proportional to the fourth power of the temperature except the region of very low temperature in which the zero-point fluctuations of phonons take part in. Furthermore, the inverse of the relaxation time of a magnon with wave vector q is shown to be proportional to q^4. The imaginary part of the dynamical transverse spin susceptibility is numerically calculated for the wave vectors near the crossing point of magnon and phonon energies.
社団法人日本物理学会の論文
1976-09-15