Quasiparticles near quantum phase transition in heavy fermion metals

TL;DR

This paper demonstrates that the Landau quasiparticle paradigm, combined with fermion condensation quantum phase transition (FCQPT), explains the universal anomalous behaviors observed in heavy fermion metals, including tunneling conductivity asymmetry and Hall coefficient jumps.

Contribution

It applies the Landau paradigm and FCQPT to explain anomalous heavy fermion behaviors, providing a unified theoretical framework for recent experimental observations.

Findings

Universal anomalous behavior explained by FCQPT

Noticeable tunneling conductivity asymmetry at T=0

Hall coefficient exhibits a jump at magnetic-field tuning

Abstract

We have shown that the Landau paradigm based upon both the quasiparticle concept and the notion of the order parameter can be used to explain the anomalous behavior of heavy fermion metals. Exploiting this paradigm and the fermion condensation quantum phase transition (FCQPT) we show that this anomalous behavior is universal and can be used to capture the essential aspects of recent experiments on the heavy-fermion metals at low temperatures. Behind FCQPT a tunneling conductivity between a heavy fermion metal and a simple metallic point can be noticeably dissymmetrical with respect to the change of voltage bias. We show that at T=0 and beyond FCQPT the Hall coefficient undergoes a jump upon magnetic-field tuning HF metals.