Magnetoresistance of amorphous metallic alloys: evidence for Coulombic interaction effects

Abstract

The magnetoresistance Delta R(H)/R(0), of Cu₅₀Ti₅₀ and Cu₆₅Ti₃₅ amorphous metallic alloys has been measured at temperatures between 16 mK and 4.2K. In both samples it was found that the positive Delta R(H)/R(0) is independent of the magnetic field direction, proportional to H^1/2 and 10⁴ times greater than the expected normal magnetoresistance. These results are compared with calculations of the magnetoresistance involving the effects of Coulombic interactions.