Electron spin resonance study of the Cr3+ion in NH4Cl between 77 and 330 degrees K

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Abstract
Electron spin resonance spectra for Cr3+ in a number of sites were observed in NH4Cl single crystals. The Cr3+ ions were in interstitial sites with magnetic axes close to (110), (110), (001) directions. The symmetry of the sites, thought to arise from two nearby vacancies, was axial with a small rhombic distortion. Parameters obtained for the most intense spectrum at 77 degrees K were D=3.189 GHz, E=0.247 GHz, gx=1.9795, gy=1.9798, gz=1.9859. The various spectra merged at 180 degrees K. This was explained in terms of bound vacancy motion, D and E were obtained between 77 and 330 degrees K, both showing a sharp increase approaching the lambda point.