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DDC: 530 × Publisher: Weinheim : Wiley-VCH × Subject: color centers × WGL Institute: IOM ×

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    Weak electron irradiation suppresses the anomalous magnetization of N-doped diamond crystals
    (Weinheim : Wiley-VCH, 2021) Setzer, Annette; Esquinazi, Pablo D.; Daikos, Olesya; Scherzer, Tom; Pöppl, Andreas; Staacke, Robert; Lühmann, Tobias; Pezzagna, Sebastien; Knolle, Wolfgang; Buga, Sergei; Abel, Bernd; Meijer, Jan
    Several diamond bulk crystals with a concentration of electrically neutral single substitutional nitrogen atoms of ≲80 ppm, the so-called C or P1 centers, are 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 30 K, after a decrease in ≲40 ppm in the concentration of C centers produced by the electron irradiation. This result indicates that magnetic C centers 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 centers, stressing the extraordinary role of the C centers 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.