PAIRING TREATMENT OF INTERACTING LOCALIZED MOMENTS IN DILUTE MAGNETIC ALLOYS.
ARIZONA UNIV TUCSON DEPT OF PHYSICS
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The Anderson model of a localized magnetic center is used to study a system of interacting localized moments in a dilute magnetic alloy. The effective interaction between centers, mediated by the conduction electrons, causes the localized quasiparticle energies to spread and lower by an amount proportional to the square root of n sub 0 n sub 0 being the density of centers. The proportionality factor is greater, by a factor of the square root of 2, in the ferromagnetic state than in the paramagnetic state. Near these localized quasiparticle energies are gaps in the conduction-band quasiparticle spectrum, the gaps being proportional to the cube root of n sub 0. With the exception of the immediate vicinity of these gaps, the conduction-band quasiparticle spectrum is spread and shifted by an amount proportional to n sub 0. These results are obtained by an equation-of-motion method that includes hole-electron pairing of a certain type. The latter allows one the flexibility of leaving unspecified the spin orientation of the electron occupying any given single-particle orbital. Author
- Solid State Physics