Crystal electric fields in heavy-electron metals: The specific heats of U2Zn17 and CeCu6 to 70 K
Abstract
Two temperature scales(1) T0 (single impurity) and/or TF* (degenerate Fermi) and (2) crystal-electric-field splitting(s) provide the basis for dividing the excitation spectra of heavy-electron systems into three regimes. They are (i) for T0T0 is qualitatively consistent with the existence of crystal-electric-field levels, but that the overall experimental entropy is too high. We present a tentative model to account for this discrepancy through the use of Fermi statistics to describe transitions in a stylized band model with two peaks. Crystal-field levels in most cases have not been confirmed by neutron scattering. © 1987 The American Physical Society.
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