Abstract
The EPR of paramagnetic impurities Gd3+ and Mn2+ was studied in nonmagnetic Kondo system La1−xCexCu6 containing in the 1.6–200 K range. The exchange interaction parameters of gadolinium and manganese ions with conduction electrons, of cerium ions with conduction electrons and with one another, the Kondo temperature of cerium ions, and the temperature behavior of cerium-ion spin-fluctuation rate have been determined. A pseudogap in the density of states at the Fermi level has been detected in the CeCu6 regular system, which is apparently due to s-f hybridization. This pseudogap can be destroyed by introducing an aluminum impurity, which induces strong conduction-electron scattering. It was also found that RKKY interaction among manganese ions in CeCu6−yMny is considerably stronger than it is in LaCu6−yMny, which implies enhancement of nonlocal spin susceptibility due to an f band contribution to conduction-electron states.
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