Abstract
We have constructed the crystalline electric field (CEF) splitting of the energy levels of Yb 3+ (4f 13) in the clean intermetallic compounds YbRh 2Si 2 and YbIr 2Si 2. The data of measurements using methods of inelastic neutron scattering, electron spin resonance, and Mössbauer spectroscopy, together with relevant structural, thermodynamic, and magnetic properties, were used as input to calculations of the CEF level schemes in these non-Fermi-liquid systems. The experimental data of both compounds are found to be well explained on the basis of the CEF 4f-schemes with the Γ t 6 - ( 1 ) ground state symmetry.
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