Experimental study of the physical properties in the complex magnetic phase diagram of Ce1-xLaxRhSn

We have investigated the electronic structure and magnetic properties of the new ternary Ce 1 - x La x RhSn system. The 3d and 4d x-ray photoelectron spectroscopy (XPS) spectra indicate a mixed valence of Ce. Analysis of the 3d 9 4f 2 weight in the 3d XPS spectra using Gunnarsson-Schonhammer theory suggests a hybridization interaction A of about 120 meV for different compositions x of the system. The magnetic measurements indicate the existence of a highly anomalous weak ferromagnetic state below ∼220 K in Ce 1 - x La x RhSn for x 0.5 is dominated by spin fluctuations.