Concurrent Magnetic and Metal-Insulator Transitions in (Eu,Sm)B_6 Single Crystals

TL;DR

This study investigates how 5% Sm doping in EuB_6 single crystals induces simultaneous magnetic and metal-insulator transitions, revealing the interplay between magnetic interactions and electronic transport.

Contribution

It demonstrates the effects of magnetic doping on EuB_6, showing how Sm substitution causes concurrent magnetic and metal-insulator transitions, a novel insight into magnetic-electronic coupling.

Findings

Sm doping alters magnetic and transport properties significantly.

Concurrent antiferromagnetic and metal-insulator transitions observed.

Magnetic doping affects carrier density and magnetic interactions.

Abstract

The effects of magnetic doping on a EuB_6 single crystal were investigated based on magnetic and transport measurements. A modest 5% Sm substitution for Eu changes the magnetic and transport properties dramatically and gives rise to concurrent antiferromagnetic and metal-insulator transitions (MIT) from ferromagnetic MIT for EuB6. Magnetic doping simultaneously changes the itinerant carrier density and the magnetic interactions. We discuss the origin of the concurrent magnetic MIT in (Eu,Sm)B_6.