Pressure effects on heavy fermion alloys

In this Letter, the effects of pressure on heavy fermion alloys are studied in the framework of the Yoshimori-Kasai model under the coherent potential approximation. A unified picture is presented for both the electron-type h eavy fermion systems and the hole-type heavy fermion systems. The density o f stares of f-electrons under the applied pressure and its variation with t he alloy concentration are calculated self-consistently. The slave-boson pa rameter and the Kondo temperature are also obtained. These calculations sho w the incorporated results of alloying effects and pressure effects, in agr eement with the experiments qualitatively. (C) 2001 Published by Elsevier S cience B.V.