Theory for effects of pressure on heavy-fermion alloys

TL;DR

This paper develops a theoretical framework to understand how pressure influences the electronic properties of heavy-fermion alloys, providing insights into their behavior under different conditions.

Contribution

It introduces a unified theoretical model for both electron- and hole-type heavy-fermion systems under pressure, including calculations of density of states and thermodynamic properties.

Findings

Qualitative agreement with experimental data on Kondo temperature and resistivity

Different pressure effects observed for electron- and hole-type alloys

Coherence effects under pressure are elucidated

Abstract

The effects of pressure on heavy-fermion alloys are studied in the framework of Yoshimori-Kasai model under the coherent potential approximation. A unified picture is presented for both the electron-type heavy-fermion systems and the hole-type heavy-fermion systems. The density of states of $f$ electrons is calculated over the whole range of the doping concentration under the applied pressure. The Kondo temperature, the specific-heat coefficient, and the electrical resistivity are obtained, in agreement with the experiments qualitatively. The contrasting pressure-dependent effects for two types of heavy-fermion alloys are discussed to reveal the coherence in the system under pressure.