Kolarics, Sándor and Bojtor, András and Koltai, Kirstóf and Klujber, Gergely and Szieberth, Máté and Márkus, Bence Gábor and Beke, Dávid and Kamarás, Katalin and Gali, Ádám and Amirari, D and Berry, Robert and Boucher, Salime (2022) Ultrahigh nitrogen-vacancy center concentration in diamond. CARBON, 188. pp. 393-400. ISSN 0008-6223
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Abstract
High concentration of negatively charged nitrogen-vacancy (NV−) centers was created in diamond single crystals containing approximately 100 ppm nitrogen using electron and neutron irradiation and subsequent thermal annealing in a stepwise manner. Continuous-wave electron paramagnetic resonance (EPR) was used to determine the transformation efficiency from isolated N atoms to NV− centers in each production step and its highest value was as high as 17.5%. Charged vacancies are formed after electron irradiation as shown by EPR spectra, but the thermal annealing restores the sample quality as the defect signal diminishes. We find that about 25% of the vacancies form NVs during the annealing process. The large NV− concentration allows observing orientation dependent spin-relaxation times and also determining the hyperfine and quadrupole coupling constants with high precision using electron spin echo (ESE) and electron-nuclear double resonance (ENDOR). We also observed the EPR signal associated with the so-called W16 centers, whose spectroscopic properties might imply a nitrogen dimer-vacancy center for its origin.
Item Type: | Article |
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Uncontrolled Keywords: | Nitrogen-vacancy center ensembles, Neutron irradiation, Electron irradiation, Electron paramagnetic resonance, Relaxation time, Electron-nuclear double resonance |
Subjects: | Q Science / természettudomány > QC Physics / fizika |
Depositing User: | Dr. Dávid Beke |
Date Deposited: | 28 Sep 2022 07:31 |
Last Modified: | 28 Sep 2022 07:31 |
URI: | http://real.mtak.hu/id/eprint/150248 |
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