Abstract
We have studied the effects of doped impurities in heavy-fermion semiconductors in the framework of the periodic Anderson model with randomly distributed mixing elements. The strong Coulomb interaction on the f orbitals is approximated by the slave-boson mean-field theory, while the effect of disorder is analyzed by the single-site coherent-potential approximation. The mechanism of energy-gap suppression is discussed with respect to the quasiparticle density of states and thermodynamic quantities as a function of impurity concentration. It is shown that a small amount of impurities leads to a drastic suppression of the energy gap. As a result, susceptibility and specific heat are strongly enhanced at low temperatures. It is pointed out that spin-compensated states are thermally unstable to local-moment states at impurity sites, which significantly affects the thermodynamic properties of the system.
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