Ferromagnetic order in U(Rh, Co)Ge

Abstract We report the variation of ferromagnetic order in the pseudo-ternary compounds URh 1− x Co x Ge (0≤ x ≤1). Magnetization and transport data taken on polycrystalline samples show that the Curie temperature T C gradually increases with increasing Co content from a value of 9.5 K for URhGe to a maximum value of 20 K for x =0.6 and then steadily decreases to 3 K for UCoGe. The magnetic interaction strength varies smoothly across the series. For all samples the electrical resistivity for T T C follows the behaviour ρ = ρ 0 + A T 2 . The A coefficient is dominated by scattering at spin waves and is strongly enhanced for x = 0 and 1 .