Quasiparticles and order parameter near quantum phase transition in heavy fermion metals

TL;DR

This paper demonstrates that the Landau paradigm, incorporating quasiparticles and the order parameter, effectively explains the universal anomalous behavior of heavy fermion metals near quantum critical points, aligning with recent experimental observations.

Contribution

It applies the Landau paradigm and fermion condensation quantum phase transition to explain heavy fermion behavior near criticality, providing a theoretical framework for experimental phenomena.

Findings

Universal anomalous behavior near quantum critical points

Agreement with recent experimental data on heavy-fermion metals

Validation of Landau paradigm in strongly correlated systems

Abstract

It is shown that the Landau paradigm based upon both the quasiparticle concept and the notion of the order parameter is valid and can be used to explain the anomalous behavior of the heavy fermion metals near quantum critical points. The understanding of this phenomenon has been problematic largely because of the absence of theoretical guidance. Exploiting this paradigm and the fermion condensation quantum phase transition, we investigate the anomalous behavior of the heavy electron liquid near its critical point at different temperatures and applied magnetic fields. We show that this anomalous behavior is universal and can be used to capture the essential aspects of recent experiments on heavy-fermion metals at low temperatures.