Figure 2

(a) Fraction of ¹⁸¹Hf probes in GaN showing the unique quadrupole interaction of _Q1 = 338 MHz (open squares) after various steps of isochronal annealing programmes and the fraction associated with a defect (open triangles). (b) Width of the frequency distribution around _Q1 (open squares) and _Q2 (open triangles).

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