The effect of hydrogenation on magnetic interactions in CeNi

The crystal structure and magnetic properties of CeNiH3.7 were studied by means of powder x-ray diffraction, specific heat, and dc and ac magnetization techniques. It was established that hydrogenation stabilizes the 4f1 state of Ce and turns CeNi–H into a dilute Kondo system with TK = 3.7 K. The Kondo screening in CeNiH3.7 is suppressed by the applied magnetic field, although it still affects the properties of CeNiH3.7 at 14 T, as indicated by the enhanced γ-coefficient of electronic specific heat, which remains more than twice as large as in the precursor compound CeNi. Its zero-field value is as high as 1890 mJ (mol K2)−1. Hydrogenation acts primarily as the negative pressure agent in CeNiH3.7, while the role of H–metal bonding is secondary.

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