Field dependence of the d.c. magnetic susceptibility in FexMg1-xCl2

Abstract
The authors have studied the temperature dependence of the susceptibility of insulating FexMg1-xCl2 in various uniform magnetic fields up to 8000 Oe. For x=0.286 spin glass behaviour is observed and the reversibility temperature moves down with field. For x=0.552 results give evidence for two transitions: paramagnetic-antiferromagnetic phase and antiferromagnetic-spin glass phases; the uniform magnetic field enlarges the domain of existence of the spin glass phase (H<5000 Oe), giving an experimental illustration of random field effects.

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