Evidence for split bands from electronic specific heat and electrical transport data in Fe--V and in other iron and nickel alloys

TLDR: The split-band model was used in this paper to explain the spin-down bands of f.c.c alloys and explain many of their properties, such as the anomalous Hall coefficient and magnetic resistivity.

Abstract: In concentrated alloys where the nuclear charges or exchange fields of the components differ sufficiently, the coherent potential approximation predicts that each alloy component has its own 3d band, having minimal overlap with the 3d bands of other components. As we pointed out earlier, this “split‐band model” applies well to the spin‐down bands of f.c.c. Ni‐Fe, Ni‐Fe‐Cu, etc., and explains many of their properties. For example, several physical quantities exhibit anomalies when the Fermi level eF crosses the boundary T between nickel and iron bands. A systematic search for b.c.c. iron‐base alloy series where the spin‐up band might be split, and where eF might cross a boundary T between bands, yields Fe‐V. As expected, the electronic specific heat coefficient γ of Fe‐V has a minimum when eF is at T, around 15 at % V. The electrical resistivity ρ, the slope ρ−1 dρ/dH, and the anomalous Hall coefficient Rs have sharp anomalies close by. The magnetoresistance Δρ/ρo is unusually large in Fe‐V. A scattering r...