Abstract
We analyze the temperature dependence of the specific heat and the quadrupole susceptibility for CePd 2 Al 3 , in which the Kondo effect coexists with the crystalline electric field (CEF) excitation. The calculation is carried out systematically by using the numerical renormalization group method. The ratio \({\mit\Delta} / \tko\) (Δ: the CEF excitation energy, \(\tko\): the Kondo temperature for the fictitious system of Δ= 0) is estimated to be about 1.2 from the data of magnetic specific heat. The observed softening of C 33 mode at very low temperature, which is expected to vanish in hexagonal compound such as CePd 2 Al 3 from the conventional CEF theory, is explained by considering the Kondo effect.
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