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Schlagwörter:
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Zusammenfassung:
The results of elastic, quasielastic, and inelastic neutron-scattering
studies on polycrystalline CeM2Ge2 (M = Ag, Au, and Ru) are presented.
All compounds reveal long-range magnetic order at low temperatures.
Ferromagnetic (M = Ru), antiferromagnetic (M = Au), and incommensurate
(M = Ag) structures were detected. Using time-of-flight (TOF)
techniques, the crystalline electric-field splittings were determined.
With high-resolution TOF experiments the temperature and wave-vector
dependence of the magnetic relaxation rate was studied. Korringa-like
behavior was found for the Au and Ru compounds. In CeAg2Ge2 the
temperature dependence of the magnetic relaxation rate exhibits a
square-root dependence at high temperatures and shows a residual
linewidth for low T. This behavior can be explained by strong
hybridization effects of the f electrons with the delocalized band
states which are active in heavy fermion systems. Previous results in
CeCu2Ge2 and CeNi2Ge2 are included, whenever necessary. Detailed
comparison is made with results obtained in the disilicides.
