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We consider, theoretically and experimentally, the effects of structuraldisorder, quantum and thermal fluctuations in the magnetic and transportproperties of certain ferromagnetic alloys.We study the particular case ofUCu2Si(2-x)Ge(x). The low temperature resistivity, rho(T,x), exhibits Fermiliquid (FL) behavior as a function of temperature T for all values of x, whichcan be interpreted as a result of the magnetic scattering of the conductionelectrons from the localized U spins. The residual resistivity, rho(0,x),follows the behavior of a disordered binary alloy. The observed non-monotonicdependence of the Curie temperature, Tc(x), with x can be explained within amodel of localized spins interacting with an electronic bath whose transportproperties cross-over from ballistic to diffusive regimes. Our results clearlyshow that the Curie temperature of certain alloys can be enhanced due to theinterplay between quantum and thermal fluctuations with disorder.Comment: 4 pages, 3 figures, to appear in Phys. Rev. Let

physical review letters

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Interplay between Disorder and Quantum and Thermal Fluctuations in Ferromagnetic Alloys: The case ofUCu2Si2−