Magneto-transport properties governed by the antiferromagnetic fluctuations in heavy fermion superconductor CeIrIn$_{5}$

TL;DR

This study investigates how antiferromagnetic fluctuations influence the unusual electron transport properties in the heavy fermion superconductor CeIrIn$_{5}$, revealing non-Fermi liquid behavior linked to magnetic fluctuations rather than valence changes.

Contribution

It demonstrates that anomalous transport in CeIrIn$_{5}$ is primarily driven by antiferromagnetic spin fluctuations, challenging previous theories emphasizing Ce-valence fluctuations.

Findings

Non-Fermi liquid behavior observed in resistivity and Hall effect.

Transport anomalies scale with Hall angle, indicating magnetic fluctuation influence.

Transport properties similar to high-$T_c$ cuprates, linked to antiferromagnetic fluctuations.

Abstract

In quasi-two dimensional Ce(Ir,Rh)In$_5$ system, it has been suggested that the phase diagram contains two distinct domes with different heavy fermion superconducting states. We here report the systematic pressure dependence of the electron transport properties in the normal state of CeRh$_{0.2}$Ir$_{0.8}$In$_{5}$ and CeIrIn$_{5}$, which locates in first and second superconducting dome, respectively. We observed non-Fermi liquid behavior at low temperatures in both compounds, including non-quadratic $T-$dependence of the resistivity, large enhancement of the Hall coefficient, and the violation of the Kohler's rule in the magnetoresistance. We show that the cotangent of Hall angle $\cot \Theta_H$ varies as $T^2$, and the magnetoresistance is quite well scaled by the Hall angle as $\Delta \rho_{xx}/\rho_{xx}\propto \tan^2\Theta_H$. The observed transport anomalies are common features of Ce$M$In$_{5}$ ($M$=Co, Rh, and Ir) and high-$T_c$ cuprates, suggesting that the anomalous transport properties observed in CeIrIn$_{5}$ are mainly governed by the antiferromagnetic spin fluctuations, not by the Ce-valence fluctuations which has been proposed to be the possible origin for the second superconducting dome.