Abstract
The rare-earth fluorides with ${\mathrm{KY}}_{3}{\mathrm{F}}_{10}$ structure are cubic, with three nonequivalent sites for the rare-earth ion, each with a tetragonal symmetry axis aligned along one of the three cubic axes. We present magnetic susceptibility and magnetization results for ${\mathrm{KDy}}_{3}{\mathrm{F}}_{10},$ a material which displays nearly complete (Ising) anisotropy of the magnetic moments along the local symmetry axis. Magnetic exchange is antiferromagnetic, and the dipole-dipole interaction favors antiferromagnetism in the absence of exchange. Despite this, we observe a spontaneously polarized magnetic state at low temperature. The explanation appears to lie in the relative magnitudes of the two interactions.
Published Version
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