paper

Magnetic and electronic inhomogeneity in Sm $_{1 - x}$ Eu $_{x}$ B $_{6}$

arXiv:2410.23199

Abstract

While SmB $_{6}$ attracts attention as a possible topological Kondo insulator, EuB $_{6}$ is known to host magnetic polarons that give rise to large magnetoresistive effects above its ferromagnetic order transition. Here we investigate single crystals of Sm $_{1 - x}$ Eu $_{x}$ B $_{6}$ by magnetic and magnetotransport measurements to explore a possible interplay of these two intriguing phenomena, with focus on the Eu-rich substitutions. Sm $_{0.01}$ Eu $_{0.99}$ B $_{6}$ exhibits generally similar behavior as EuB $_{6}$ . Interestingly, Sm $_{0.05}$ Eu $_{0.95}$ B $_{6}$ combines global antiferromagnetic order with local polaron formation. A pronounced hysteresis is found in the magnetoresistance of Sm $_{0.1}$ Eu $_{0.9}$ B $_{6}$ at low temperature ( $T =$ 1.9 K) and applied magnetic fields between 2.3 $-$ 3.6 T. The latter is in agreement with a phenomenological model that predicts the stabilization of ferromagnetic polarons with increasing magnetic field within materials with global antiferromagnetic order.

9 pages, 10 figures

Magnetic and electronic inhomogeneity in Sm1−x​Eux​B6​

Abstract

Magnetic and electronic inhomogeneity in Sm $_{1 - x}$ Eu $_{x}$ B $_{6}$