An Itinerant Electron Model for the Critical Sound Propagation in Ferromagnetic Metals
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概要
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The critical behavior of sound propagation above T_c in ferromagnetic metals in studied from an itinerant electron model with the generalized random phase approximation. First, by using the Feynman diagrammatic method, the phonon frequency of a metal, both above and below T_c, is related to the magnetic properties of the metal. Then, in the jellium model the velocity s and attenuation α_q of sound above T_c is found to be simply related to the paramagnetic spin susceptibility, X_<mm>, respectively as, s∝X^<-1/2>_<mm> and α_q∝X_<mm>. When the temperature is very close to T_c, however, above simple behavior of s and α_q breaks down owing to the increased imaginary part of the phonon frequency. At T_c, s does not vanish and correspondingly α_q does not diverge.
- 社団法人日本物理学会の論文
- 1976-05-15
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