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Magnetotransport in the low carrier density ferromagnet EuB6

S. Suellow, I. Prasad, S. Bogdanovich, M. C. Aronson, J. L. Sarrao, Z. Fisk

cond-mat.str-elarXiv:cond-mat/9912390

Abstract

We present a magnetotransport study of the low--carrier density ferromagnet EuB6. This semimetallic compound, which undergoes two ferromagnetic transitions at Tl = 15.3 K and Tc = 12.5 K, exhibits close to Tl 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 EuB6.

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