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UH 3 thin films have been prepared by dc sputtering of uranium in presence of hydrogen, and studied in situ by valence band and core level spectroscopy. X-ray diffraction measurements showed formation of ␤-UH 3 , and magnetization experiments demonstrate that the films are ferromagnetic with T C = 178 K. Valence band spectra showed that the films are metallic. The 5f states are positioned at the Fermi level, proving their itinerant character. Broadening of the 5f peak is attributed to correlation effects, or possibly the appearance of final-state multiplets. U 4f core level spectra showed a main peak at slightly higher binding energy (BE) than U metal, accompanied by a broad correlation satellite at 6 eV high BE.

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The magnetic response of CeFe2 single crystals was studied by direct-current magnetization and linear and nonlinear alternating-current susceptibility measurements. Several anomalies have been observed below the Curie temperature (TC=228 K). A kink near 30 K in the real component of the linear susceptibility, χ1′(T), is accompanied by a frequency dependent peak in both the linear imaginary part, χ1″(T), and the third-harmonic nonlinear susceptibility, |(3/4)χ3H02|. It is suggested that these features are related to the development of antiferromagnetic spin fluctuations of growing spatial extension, indicating an electronic instability below 80 K.

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