Magnetotransport properties governed by antiferromagnetic fluctuations in the heavy-fermion superconductorCeIrIn5

Abstract

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