Phase Diagram of Heavy Fermion Metal CeCoIn5

TL;DR

This paper analyzes the low-temperature phase diagram of CeCoIn5, showing it can be explained by Fermi-liquid theory with fermion-condensate states, offering insights into quasiparticles and non-Fermi liquid behavior.

Contribution

It demonstrates that the phase diagram of CeCoIn5 can be understood through fermion-condensate states, suppressing quantum critical fluctuations and linking quasiparticle properties to non-Fermi liquid behavior.

Findings

Fermi-liquid theory explains the phase diagram with fermion-condensate states.

Quantum critical fluctuations are suppressed in CeCoIn5.

The system offers a platform to study quasiparticles and non-Fermi liquid behavior.

Abstract

We present a comprehensive analysis of the low temperature experimental H-T phase diagram of CeCoIn5. The main universal features of the diagram can be explained within the Fermi-liquid theory provided that quasiparticles form so called fermion-condensate state. We show that in this case the fluctuations accompanying an ordinary quantum critical point are strongly suppressed and cannot destroy the quasiparticles. Analyzing the phase diagram and giving predictions, we demonstrate that the electronic system of CeCoIn5 provides a unique opportunity to study the relationship between quasiparticles properties and non-Fermi liquid behavior.