Mott two-current model: ρ_P ~ parallel of (ρ_↑ ∥ ρ_↓), both low; ρ_AP ~ series

Mott 1936 / 1964 two-current model: in a ferromagnet, electrons with spin-majority and spin-minority at E_F scatter through independent channels with resistivities ρ_↑ and ρ_↓. In a symmetric two-electrode device: ρ_P (parallel…