Abstract
An investigation of the magnetic properties of powder samples of Co x Zn 1- x F 2 for a complete range of compositions was undertaken using low field dc magnetic susceptibility and diffuse polarised neutron scattering measurements. The Néel temperature, as determined from the cusp in the powder susceptibility, was found to agree with percolation theory predictions. There was no evidence of spin glass behaviour from any of the measurements above 2.6 K for Co 0.26Zn 0.74F 2, or above 4.2 K for Co 0.2Zn 0.8F 2 and Co 0.1Zn 0.9F 2. All susceptibility data are fitted in the paramagnetic region with a simple molecular field model allowing for crystal field effects and spin-orbit coupling.
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