We report the magnetic phase diagram of an itinerant-electron ferromagnetic system, U(Co1−xOsx)Al, derived from the C susceptibility and DC magnetization. The quantum phase transition point at which the ferromagnetic transition temperature becomes 0 K is estimated to be located at x ≈ 0.004. The tricritical point is also estimated to be located at x ≈ 0.0065, T ≈ 11 K. We also observed a non-Fermi liquid behavior near the quantum phase ransition point: the temperature (T) dependence of the electrical resistivity (ρ) in the paramagnetic region is ρ ∝ T 3=2 rather than ρ ∝ T 5=3 that is predicted at the quantum critical point. The T3=2 dependence is observed in some other itinerant-electron agnets, e.g., ZrZn2 and MnSi. We discuss the possible mechanisms applied to these compounds.
ASJC Scopus subject areas
- Physics and Astronomy(all)