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Structure and magnetic order of EuB6 S. Sullow, I. Prasad, and M. C. Aronson

Summary: Structure and magnetic order of EuB6
S. Sušllow, I. Prasad, and M. C. Aronson
Department of Physics, 2071 Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120
J. L. Sarrao* and Z. Fisk
National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Florida State University, Tallahassee, Florida 32310
D. Hristova, A. H. Lacerda, and M. F. Hundley
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
A. Vigliante and D. Gibbs
Brookhaven National Laboratory, Upton, New York 11973-5000
Received 8 September 1997; revised manuscript received 12 November 1997
We present a study of the structural and magnetic properties of single-crystalline EuB6. Temperature-
dependent x-ray diffraction found no significant anomalies at the onset of ferromagnetic order. The resistivity,
dc susceptibility, magnetization, and specific heat prove the crystal to be of extraordinarily high quality. Two
ferromagnetic transitions at Tc1 15.3 K and Tc2 12.5 K are observed in all investigated properties. The
ordered state displays an unexpected anisotropy, and we derive the magnetic phase diagrams for the three
principal cubic directions. We argue that the two magnetic phases are connected by spin reorientation, enabled
by a reduction of the crystalline symmetry from cubic. An additional anomaly in the specific heat is observed
at low temperatures, which we interpret as arising from the splitting of the Eu ground-state multiplet in internal
magnetic fields. S0163-1829 98 00610-9


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


Collections: Materials Science; Physics