Abstract
The electron spin resonance linewidth of Ni 2+ in single crystal MgO was examined theoretically and experimentally at 9 GHz for a Ni 2+ concentration of 1400 ppm. The experimental peak-to-peak linewidth for the δM s = ±1 transition had a value of about 6 mT over the temperature range 180 to 20 K and was polar angle dependent. The calculated dipolar linewidth exceeded that observed by a factor of about five; the ratio of moments M 1 4 4/M 1 2 2 derived from experimental data was 1.34; the lineshape was Lorentzian and independent of polar angle. The data suggested that Ni 2+ entered the lattice substitutionally, occupying magnesium sites, and that the linewidth for the δM s = ±1 transition was determined by exchange narrowing together with inhomogeneous broadening due to internal strain.
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