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Summary: Magnetotransport in the low carrier density ferromagnet EuB6
S. Sušllowa)
Department of Physics, 2071 Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-
1120 and Institut fušr Metallphysik. TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig,
Germany
I. Prasad,b)
S. Bogdanovich,c)
and M. C. Aronson
Department of Physics, 2071 Randall Laboratory, University of Michigan, Ann Arbor,
Michigan 48109-1120
J. L. Sarraod)
and Z. Fisk
National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Florida State University,
Tallahassee, Florida 32310
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. © 2000
American Institute of Physics. S0021-8979 00 62208-9
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