Abstract
Magnetic measurements on Al-flux grown EuB6 crystals show that this material orders ferromagnetically with a transition temperature Tc=13.7 K. The effective moment derived from paramagnetic susceptibility measurements gives μeff=7.76 μB, and the saturation magnetization extrapolated to 0 K is within 10% of the theoretical value of 7 μB expected for Eu+2. The magnetic order, however, cannot be that of a simple colinear ferromagnet because the magnetic specific heat in zero applied magnetic field shows a broad maximum centered about 9 K rather than the expected λ-like anomaly at 13.7 K. Finally, transport measurements suggest that EuB6 is an intrinsic semimental.
Highlights
EuB6 is a cubic material crysta1lizing in a structure which may be regarded as a CsCl-type array of Eu atoms and 86 octahedra
A recent investiga· tion of carbon substituted Eu B6 indicates, howeve r, chat both the lattice constant and ehe paramagnetic Curie temperature diminish smoothly with increasing carbon content [2), that the order c hanges from ferro 10 antiferromagnetic [31. and that the Eu is divalent throughout the series; Kasaya, et al [2] suggest that the earlier finding of antiferromagnetism fl] may be due to carbon con1amination
We present our findings below. along with a few cornparative measurement~ on crystals grown from molten Eu metal
Summary
Jnftitute for Purl! and Applied Physical Sciences, Uni11ersi1y of Ca/ifornia. San Diego. la Jollu. Magnetic rneasuremcnts on Al-Ou„ grown EuB6 crystals show that this material orders ferromagnetically with a transition temperature Tc = 13.7 K. The effective moment derive
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