Spontaneous resistivity anisotropy in nickel-copper alloys

Kaul, S. N. (1977) Spontaneous resistivity anisotropy in nickel-copper alloys Journal of Physics F: Metal Physics, 7 (10). pp. 2091-2108. ISSN 0305-4608

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Official URL: http://iopscience.iop.org/0305-4608/7/10/011

Related URL: http://dx.doi.org/10.1088/0305-4608/7/10/011


The longitudinal and transverse magnetoresistivity of pure nickel and its alloys containing 9.38, 18.77 and 28.32 at.% of copper were measured from room temperature to temperatures well above their Curie temperature in fields up to 10 kOe. A theory based on the well known two-current conduction model proved adequate to explain the temperature dependence observed for the spontaneous resistivity anisotropy Δ ρs/ ρ =( Δ rhos/(T)- Δ ρ ⊥ s(T))/ ρ . Based on this theory, the temperature dependence of spin-up ( ρ spin upi(T)) and spin-down ( ρ spin downi(T)) resistivities was computed. The temperature dependence of resistivity for the two spin directions demonstrated that (i) both s-s and s-d scattering processes contribute to τspin downi(T) as contrasted with ρspin upi(T) which arises solely from s-d scattering and (ii) contribution to ρ spin downi(T) from s spin down-d spin down scattering dominates s spin down-s spin down scattering for temperatures in the immediate vicinity of room temperature, whereas the reverse situation arises for temperatures close to the Curie temperature.

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