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Abstract
ESR spectra of doped antiferromagnetic compounds exhibit a concentration-dependent line width ∆B̄(x). We have investigated polycrystalline samples of Cr2O3 doped with Ga2O3 and Al2O3. For temperatures T sufficiently high above the Néel point TN and for concentrations x≦10%, the experimental values of AB show a linear dependence on x. This behaviour deviates from theoretical predictions based on the method of second moments. Starting with other reasonable assumptions, we have developed a statistical model of resonance that describes ∆B(x) as a linear function of x. Moreover this allows us to deduce that as far as antiferromagnetic Cr2O3 is concerned, the dopants Ga2O3 and AI2O3 are distributed homogeneously throughout the lattice sites.
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