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Abstract:
The energy-loss spectra of CeCu2Si2 and LaCu2Si2 have been determined using neutrons of high incident energy. The magnetic part of the low-temperature spectra of CeCu2Si2 consists of a quasielastic line and two inelastic lines at 12.5 and 31 meV resulting from transitions between the Kramers ground state and two excited crystal-field doublets of Ce3+ in tetragonal symmetry. When positions as well as intensities of the inelastic lines are used, the crystal-field level scheme can be derived. The temperature dependence and magnitude of the quasielastic linewidth suggest that the contribution of Kondo-type spin fluctuations to the spin dynamics of CeCu2Si2 predominates over that of valence fluctuations. No indication of any magnetic ordering in CeCu2Si2 was found by neutron diffraction down to the mK range.
