Abstract
We present the results of inelastic neutron scattering experiments on the intermediate-valent system YbPd2Si2 to investigate the magnetic relaxation behaviour. We have performed measurements on polycrystalline samples with neutrons of incident energyE 0=3.1 meV at temperatures between 1.5 K and 250 K, and withE 0=12.7 meV andE 0=50.8 meV at temperatures between 5 K and 50 K using time-of-flight spectrometers. At temperaturesT>50 K we find a pure quasielastic magnetic response with a rather broad linewidth typical for intermediate-valent systems. AtT≈50 K an inelastic excitation line appears at about 21 meV; its intensity increases with decreasing temperature. In the same temperature range (T<50 K) the quasielastic linewidth decreases rapidly and atT=5 K the quasielastic response has been apparently transformed to a second inelastic feature at about 4.7 meV. The width of this low-energy excitation fits well to the temperature dependence of the quasielastic linewidth forT>5 K.
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Weber, W., Holland-Moritz, E. & Murani, A.P. Magnetic relaxation spectra of YbPd2Si2 . Z. Physik B - Condensed Matter 76, 229–233 (1989). https://doi.org/10.1007/BF01312689
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DOI: https://doi.org/10.1007/BF01312689