Normal-state Hall Angle and Magnetoresistance in quasi-2D Heavy Fermion CeCoIn_5 near a Quantum Critical Point

TL;DR

This study investigates the normal-state transport properties of CeCoIn_5 near a quantum critical point, revealing behaviors similar to high-T_c cuprates and suggesting universal features in quasi-2D heavy fermion systems.

Contribution

It uncovers a novel relation between magnetoresistance and Hall conductivity in CeCoIn_5, highlighting universal transport phenomena near quantum criticality.

Findings

Hall angle varies as cot θ_H ∝ T^2 in the non-Fermi liquid region

Magnetoresistance violates Kohler's rule significantly

A new relation Δρ_xx/ρ_xx ∝ (σ_xy ρ_xx)^2 is demonstrated

Abstract

The normal-state Hall effect and magnetoresisitance (MR) have been measured in the quasi-2D heavy fermion superconductor CeCoIn_5. In the non-Fermi liquid region where the reistivity rho_xx exhibits an almost perfect T-linear dependence, the Hall angle varies as cot theta_H propto T^2 and the MR displays a strong violation of Kohler's rule. We demonstrate a novel relation between the MR and the Hall conductivity, Delta rho_xx/rho_xx propto (sigma_xy rho_xx)^2. These results bear a striking resemblance to the normal-state properties of high-T_c cuprates, indicating universal transport properties in the presence of quasi-2D antiferromagnetic fluctuations near a quantum critical point.