High-frequency point contact (PC) spectroscopy is used to investigate the relaxation process kinetics in the intermetallic rare-earth compound PrNi₅. A difference is observed in the spectral response between the conventional low-frequency PC data and the response signal to microwave and far-infrared radiation of PrNi₅ point contacts. This difference is connected with the f-shell electronic levels (CEF levels) and phonon temporal dynamics. The phonon reabsorption contribution to the spectra above the Debye energy decreases for microwave and far-infrared frequences. However, the crystal-field contribution to the spectra at 4,2 meV is enhanced for high frequences reflecting the relaxation processes specific for these Fermi-statistics electron excitations. The characteristics frequency for CEF-level relaxation is evaluated as ~ 200 GHz.

• Янсон Ігор Кіндратович (1938–2011) (фізико-математичні науки)

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