Abstract
We consider the local properties of theYb3+ ion in the crystal electric field in the Kondo lattice compoundsYbRh2Si2 and YbIr2Si2. On this basis we have calculated the magnetic susceptibility, taking into account theKondo interaction in the simplest molecular field approximation. The resulting Curie–Weisslaw and Van Vleck susceptibilities could be excellently fitted to experimental results over awide temperature interval where thermodynamic and transport properties shownon-Fermi-liquid behavior for these materials.
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