Magnetoresistance of UPt3

TL;DR

This study investigates the magnetoresistance behavior of UPt3 single crystals under magnetic fields up to 9 T, revealing linear terms indicative of broken symmetry related to magnetic order.

Contribution

It provides new measurements of longitudinal magnetoresistance in UPt3 and confirms the presence of linear terms associated with magnetic order, expanding understanding of its anisotropic magnetic properties.

Findings

Linear magnetoresistance terms indicate broken symmetry.

Linear term appears near 5 K with current along c axis.

Negative linear contribution observed with current along b axis.

Abstract

We have performed measurements of the temperature dependence of the magnetoresistance up to 9 T in bulk single crystals of UPt3 with the magnetic field along the b axis, the easy magnetization axis. We have confirmed previous results for transverse magnetoresistance with the current along the c axis, and report measurements of the longitudinal magnetoresistance with the current along the b axis. The presence of a linear term in both cases indicates broken orientational symmetry associated with magnetic order. With the current along the c axis the linear term appears near 5 K, increasing rapidly with decreasing temperature. For current along the b axis the linear contribution is negative.