Exchange coupled pairs of dangling bond spins as a new type of paramagnetic defects in nanodiamonds

V. Yu Osipov, A. I. Shames, A. Ya Vul'

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20 Scopus citations


EPR in detonation nanodiamonds (DND) reveals two different signals associated with intrinsic carbon inherited paramagnetic defects. Main carbon inherited EPR signal is narrow intensive Lorentzian-like singlet with g=2.0028 and spin concentration Ns=(6-7)×1019 spin/g that yields on average 13-15 spins per each DND particle. Additional chemical treatment of DND powder allows practically complete removal of trace amounts of transition metal impurities that reveals a new doublet EPR signal consisting of two relatively narrow lines within the half-field region (g∼4) separated by a distance of 10.4 mT. The intensity of the doublet signal is five orders of magnitude lower than that of the main singlet signal. The former signal has been observed in a wide variety of DND samples disregarding of the impurity level reached and thus may be attributed to some intrinsic defects in DND particles. Such half-field EPR signals correspond to "forbidden" ΔMs=2 transitions within thermally populated triplet (S=1) levels observed in polycrystalline samples containing exchange dimers-antiferromagnetically coupled spin pairs. Estimates suggest that the concentration of such defects is about one dimer per hundreds DND particles.

Original languageEnglish
Pages (from-to)4522-4524
Number of pages3
JournalPhysica B: Condensed Matter
Issue number23-24
StatePublished - 15 Dec 2009


  • EPR
  • Exchange coupled spins
  • Low temperatures
  • Nanodiamonds
  • Paramagnetic defects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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