Investigation of the Field-Tuned Quantum Critical Point in CeCoIn_5

TL;DR

This paper investigates the quantum critical point in CeCoIn_5 under magnetic fields, analyzing how effective mass, resistivity, and specific heat behave in different regimes, aligning theoretical predictions with experimental data.

Contribution

It presents a detailed analysis of the field-tuned quantum critical point in CeCoIn_5 using the fermion condensation quantum phase transition scenario, highlighting specific temperature and field dependencies.

Findings

Effective mass scales as T^{-2/3} in high-field non-Fermi liquid regime.

Resistivity follows a T^{2/3} dependence in the same regime.

At higher temperatures, effective mass scales as T^{-1/2} and resistivity becomes linear in T.

Abstract

The main properties and the type of the field-tuned quantum critical point in the heavy-fermion metal CeCoIn$_5$ arisen upon applying magnetic fields $B$ are considered within the scenario based on the fermion condensation quantum phase transition. We analyze the behavior of the effective mass, resistivity, specific heat, charge and heat transport as functions of applied magnetic fields $B$ and show that in the Landau Fermi liquid regime these quantities demonstrate the critical behavior which is scaled by the critical behavior of the effective mass. We show that in the high-field non-Fermi liquid regime, the effective mass exhibits very specific behavior, $M^*\sim T^{-2/3}$, and the resistivity demonstrates the $T^{2/3}$ dependence. Finally, at elevated temperatures, it changes to $M^*\sim T^{-1/2}$, while the resistivity becomes linear in $T$. In zero magnetic field, the effective mass is controlled by temperature $T$, and the resistivity is also linear in $T$. The obtained results are in good agreement with recent experimental facts.