Superhyperfine Structure in EPR of Cr-Doped SnO2 Single Crystals

The electron paramagnetic resonance (EPR) of Cr-doped SnO 2 crystals has been studied using an X-band spectrometer at room temperature. In the as-grown crystals, two distinct EPR spectra, designated as (EPR) I and (EPR) II , with different values of the spin-Hamiltonian parameters have been observed in our experiments. The lines of these spectra are superhyperfine-broadened with superhyperfine structure (shfs) of neighboring Sn nuclei. The line-intensity ratio of the shfs for the (EPR) II has been 1.000:0.477:0.141:0.120:0.195:0.096:0.040. The analysis of the line-intensity ratio of the shfs shows that the (EPR) II is not due to Cr 3+ ions in the interstitial positions, but is attributed to Cr 3+ in the substitutional sites with a rhombic distortion in SnO 2 crystal.

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