Abstract
Electron spin resonance linewidths of Fe3+ in single crystal MgO were examined at 9 GHz for crystals having iron concentrations of 2300 ppm and 4300 ppm over the temperature range 293 to 4.2 K. For the + 1/2 → −1/2 transition the linewidth remains constant from 293 to about 15 K, below which line broadening occurs. From 15 to 4.2 K the linewidth increases steadily without any change in the g value of the line. At 4.2 K the width of the line is about 3.7 times larger than at 77 K for each concentration. The lineshapes are Lorentzian over the whole temperature range examined and the data suggested that the effects observed below 15 K were due to non-secular line broadening mechanisms (the “10/3” effect) originally proposed by Anderson and Weiss.
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Thorp, J.S., Hossain, M.D. ESR line broadening of Fe3+ in Fe/MgO at low temperatures. J Mater Sci 15, 2647–2650 (1980). https://doi.org/10.1007/BF00550771
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DOI: https://doi.org/10.1007/BF00550771