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High pressures and ferromagnetic order in EuB6 J. C. Cooley* and M. C. Aronson

Summary: High pressures and ferromagnetic order in EuB6
J. C. Cooley* and M. C. Aronson
Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1120
J. L. Sarrao* and Z. Fisk
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306
Received 3 July 1997
We have measured the electrical resistivity (T) of single crystals of EuB6 for temperatures from 1.2 to 300
K, and pressures from 1 bar to 169 kbar. The room temperature resistivity 300 K is dramatically reduced with
pressure, while the double ferromagnetic ordering temperatures Tc
are strongly enhanced. We argue that
magnetic order is driven by the Ruderman-Kittel-Kasuya-Yosida interaction between Eu moments and pockets
of carriers at the semimetallic X point. With pressure, the band overlap increases, leading to an increase in
carriers at the Fermi surface and the decrease of the spin disorder scattering in the paramagnetic state.
S0163-1829 97 04345-2
EuB6 has a long history as a prototypical ferromagnet, due
to its crystalline simplicity, as well as its decidedly localized
and isotropic Eu moment.1
Despite its potential as a model
system, the relationship between the ferromagnetism and the


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


Collections: Materials Science; Physics