ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Existing values of the magnetoresistance (ρ(parallel)−ρ⊥)/ρ0 for crystalline Ni1−xFex, Ni1−xCox, Ni1−xMnx, Fe1−xCrx, and Fe1−x-Vx alloys depend on x in a way which disagrees with the traditional Smit theory, based on the Born approximation. The reasons are related to the variation of the 3d wave-function amplitude between chemically different atoms and, in turn, to a variation of s-d scattering intensity. Experimental atomic moments indicate that this 3d amplitude variation is large. The variation is related to the fact that d-d scattering is strong and resonant. We predict large deviations from Nordheim's rule ρ↓∝ x(1−x) where ρ↓ is the spin-down resistivity, similar to the deviations found experimentally. Correspondingly, (ρ(parallel)−ρ⊥)/ρ0 is much larger for x(approximately-equal-to)0 than for x(approximately-equal-to)1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.345882
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