Ferromagnetic order in U(Rh,Co)Ge

TL;DR

This study investigates how ferromagnetic order varies in URh_{1-x}Co_{x}Ge compounds, revealing a non-monotonic change in Curie temperature and consistent Fermi-liquid behavior below T_{C}.

Contribution

It provides detailed experimental data on the evolution of ferromagnetism and electronic properties across the URh_{1-x}Co_{x}Ge series, highlighting the smooth variation of magnetic interactions.

Findings

Curie temperature increases then decreases with Co content

Electrical resistivity follows rac{ ho_{0} + AT^2}{ ho_{0} + AT^2} behavior below T_{C}

A coefficient peaks at x=0 and x=1, indicating strong spin-wave scattering

Abstract

We report the variation of ferromagnetic order in the pseudo-ternary compounds URh_{1-x}Co_{x}Ge (0 \leq x \leq 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 \rho = \rho_{0} + AT^2. The A coefficient is dominated by scattering at spin waves and is strongly enhanced for x = 0 and 1.