Pressure effect on magnetism in CeTe$_{1.82}$

TL;DR

This study investigates how applying pressure influences the magnetic and transport properties of CeTe$_{1.82}$, revealing increased Kondo temperature and magnetic transition temperatures, and suggesting enhanced electron coupling under pressure.

Contribution

It provides new insights into pressure-induced changes in magnetism and electron interactions in CeTe$_{1.82}$, a superconductor, highlighting the pressure dependence of its magnetic and transport behaviors.

Findings

Pressure increases the Kondo temperature scale to ~170 K.

Both ferromagnetic and antiferromagnetic transition temperatures slightly rise with pressure.

Magnetoresistance behavior under pressure is similar to ambient conditions near magnetic transitions.

Abstract

We report the normal-state transport and magnetic properties of a pressure-induced superconductor CeTe$_{1.82}$. We found that the applied pressure is required to increase the Kondo temperature scale ($T^*_{\rm K} \sim$ 170 K), associated with the two-dimensional motion of the carriers confined within the Te plane. Both the short-range ferromagnetic ordering temperature ($T_{\rm SRF} \sim$ 6 K) and the long-range antiferromagnetic transition temperature ($T_{\rm N} \sim$ 4.3 K) are slightly increased with pressure. We suggest that the application of pressure enhances a coupling between the 4$f$ and conduction electrons. We also found that the field effect on the transport under pressure is analogous to that at ambient pressure, where a large magnetoresistance is observed in the vicinity of $T_{\rm SRF}$.