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    Moderately heavy, heavy-fermion compound YbPd2Si2 at low temperatures

    P. Schlottmann

    • Department of Physics and Center for Materials Science and Technology, Florida State University, Tallahassee, Florida 32306

    Phys. Rev. B 46, 217 – Published 1 July, 1992

    DOI: https://doi.org/10.1103/PhysRevB.46.217

    Abstract

    The available experimental data on the specific heat, magnetic susceptibility, magnetization, valence, NMR Knight shift and relaxation rate, and the quadrupolar moment of YbPd2Si2 are examined within the framework of the single-ion Anderson model. Such an analysis has previously given excellent agreement between theory and experiment for numerous other light heavy-fermion compounds, where crystalline fields do not play a dominant role. For YbPd2Si2, substantial crystalline-field splittings make difficult a quantitative comparison with existing exact solutions of the Anderson model. Inconsistencies with the interpretation that a nearly degenerate ground quadruplet determines the low-temperature thermodynamics are pointed out. It is concluded that at least three of the four Kramers doublets participate in the low-T properties. These three doublets should have a splitting of the order of the Kondo temperature, i.e., about 100 K. A simple resonant-level model parametrizing the NMR relaxation rate at low T is presented. Finally, hydrostatic-pressure experiments are suggested to study the nature of the faint, ordered phase at very low temperatures.

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