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Metallization and magnetic order in EuB6 S. Sullow,1,* I. Prasad,1,
 

Summary: Metallization and magnetic order in EuB6
S. Sušllow,1,* I. Prasad,1,
M. C. Aronson,1
S. Bogdanovich,1,
J. L. Sarrao,2,§
and Z. Fisk2
1
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109­1120
2
National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Florida State University, Tallahassee, Florida 32310
Received 9 February 2000
We present the results of field- and temperature-dependent resistivity and magnetization M measurements
which show that colossal magnetoresistance in semimetallic EuB6 is not associated with its bulk Curie tem-
perature TC 12.6 K, determined by a scaling analysis of M(H,T), but with a second phase transition at
TM 15.5 K. We propose that metallization occurs at TM via the overlap of magnetic polarons. The separation
of the charge delocalization and bulk magnetic ordering transitions implies electronic and magnetic phase
separation.
The discovery of colossal magnetoresistance CMR in
rare-earth manganites and manganese pyrochlores has re-
newed interest in the properties of magnetic polarons.1

  

Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook

 

Collections: Materials Science; Physics