Electrical and Magnetic Properties of Paramagnetic Vanadium-Iron Alloys

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Abstract
The low‐temperature electrical resistivities, magnetoresistances, and magnetic susceptibilities of VFe alloys have been measured in the range 18–28% iron, the range in which VFe undergoes a transition from Pauli paramagnetism to ferromagnetism. The measurements were repeated after plastic deformation to determine the effects the effects of short‐range atomic order on the CsCl‐like crystal structure of these alloys. The onset of a magnetic scattering mechanism is observed at 22% iron by the appearance of minima in the resistivity‐temperature curves, by an increase in (dρ/dc), and by a negative magnetoresistance. The field dependences of the susceptibilities indicate interactions between ferromagnetic clusters. The electrical properties are interpreted in terms of spin‐flip scattering from ferromagnetic clusters. The increases in magnetic susceptibility and in the magnitude of the negative magnetoresistance with plastic deformation are interpreted in terms of a defect structure which increases the number of iron‐iron nearest neighbors. The data for V(24% Fe) yield an estimated average cluster moment of 40 μB and an effective cluster concentration of 0.01%.