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Title: Spin coherence and 14N ESEEM effects of nitrogen-vacancy centers in diamond with X-band pulsed ESR

Journal Article · · Diamond and Related Materials
 [1];  [2];  [1];  [3];  [1]
  1. Princeton Univ., NJ (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Ilmenau Univ. of Technology (Germany)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Pulsed ESR experiments are reported for ensembles of negatively-charged nitrogen-vacancy centers (NV  - ) in diamonds at X-band magnetic fields (280–400 mT) and low temperatures (2–70 K). The NV  - centers in synthetic type IIa diamonds (nitrogen impurity concentration   < 1 ppm) are prepared with bulk concentrations of 2 • 10 13 cm  -3 to 4• 10 14 cm  -3 by high-energy electron irradiation and subsequent annealing. We find that a proper post-radiation anneal (1000°C for 60 min) is very important to repair the radiation damage and to recover long electron spin coherence times for NV  - s. After the annealing, spin coherence times of T 2  = 0.74ms at 5 K are achieved, being only limited by 13 C nuclear spectral diffusion in natural abundance diamonds. By measuring the temperature dependence of T 2 in the under-annealed diamonds (900°C) we directly extract the density (10 14 -16 cm  -3 ) and activation energy (2.5 meV) of unannealed defects responsible for the faster NV  - decoherence. At X-band magnetic fields, strong electron spin echo envelope modulation (ESEEM) is observed originating from the central 14 N nucleus, and we extract accurate 14 N nuclear hypefine and quadrupole tensors. In addition, the ESEEM effects from two proximal 13 C sites (second-nearest neighbor and fourth-nearest neighbor) are resolved and the respective 13 C hyperfine coupling constants are extracted.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379707
Journal Information:
Diamond and Related Materials, Vol. 72, Issue C; ISSN 0925-9635
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Colour centre generation in diamond for quantum technologies journal November 2019
Observation of an environmentally insensitive solid-state spin defect in diamond journal July 2018

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