Weak electron irradiation suppresses the anomalous magnetization of N-doped diamond crystals
arXiv:2108.13850 · doi:10.1002/pssb.202100395
Abstract
Several diamond bulk crystals with a concentration of electrically neutral single substitutional nitrogen atoms of ppm, the so-called C- or P1-centres, were irradiated with electrons at 10 MeV energy and low fluence. The results show a complete suppression of the irreversible behavior in field and temperature of the magnetization below ~K, after a decrease of ppm in the concentration of C-centres produced by the electron irradiation. This result indicates that magnetic C-centres are at the origin of the large hysteretic behavior found recently in nitrogen-doped diamond crystals. This is remarkable because of the relatively low density of C-centres, stressing the extraordinary role of the C-centres in triggering those phenomena in diamond at relatively high temperatures. After annealing the samples at high temperatures in vacuum, the hysteretic behavior is partially recovered.
arXiv comment15 pages, 10 figures
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