Magnetotransport in the low carrier density ferromagnet EuB_6
S. Suellow, I. Prasad, S. Bogdanovich, M.C. Aronson, J.L. Sarrao, and, Z. Fisk
TL;DR
This study investigates the magnetotransport properties of EuB_6, a low-carrier density ferromagnet, revealing colossal magnetoresistivity near the transition temperature and highlighting discrepancies with existing theories due to magnetic polaron formation.
Contribution
It provides detailed experimental data on EuB_6's magnetotransport behavior and identifies the role of magnetic polarons, challenging current theoretical explanations.
Findings
EuB_6 exhibits colossal magnetoresistivity near T_l.
Discrepancies between experimental data and theoretical models.
Magnetic polaron formation is key to understanding EuB_6's properties.
Abstract
We present a magnetotransport study of the low--carrier density ferromagnet EuB_6. This semimetallic compound, which undergoes two ferromagnetic transitions at T_l = 15.3 K and T_c = 12.5 K, exhibits close to T_l a colossal magnetoresistivity (CMR). We quantitatively compare our data to recent theoretical work, which however fails to explain our observations. We attribute this disagreement with theory to the unique type of magnetic polaron formation in EuB_6.
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