Experimental study of physical properties in the complex magnetic phase diagram of Ce ( Rh 1 − x Ru x ) 3 B 2

We report on a series of structural, magnetic, and thermodynamic measurements, a study of transport properties and x-ray absorption edge spectroscopy on $\mathrm{Ce}({\mathrm{Rh}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{)}_{3}{\mathrm{B}}_{2}.$ These investigations evidence that in addition to the already established ferromagnetic range for $xl~0.06,$ a complex antiferromagnetic structure exists for concentrations $0.1l~xl~0.35.$ The behavior in the latter regime is dominated by an extraordinary strong intersite coupling; however, the magnetic moments involved appear to be very small. At the phase boundary to the paramagnetic regime $(x\ensuremath{\approx}0.4),$ significant deviations from a Fermi-liquid behavior occur.