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A low-field temperature-dependent EPR signal in terraced MgO:Mn2+ nanoparticles: an enhanced Zeeman splitting in the wide-bandgap oxide

Authors
  • Pikhitsa, Peter V.
  • Chae, Sukbyung
  • Shin, Seungha
  • Choi, Mansoo
Type
Preprint
Publication Date
May 22, 2016
Submission Date
May 22, 2016
Identifiers
arXiv ID: 1605.06883
Source
arXiv
License
Yellow
External links

Abstract

Mn2+ ion doping is used as an electron paramagnetic resonance (EPR) probe to investigate the influence of low-coordination structural defects such as step edges at the surface of terraced (001) MgO nanoparticles on the electronic properties. Beside the well-known hyperfine sextet of Mn2+ ions in the cubic crystal field of MgO, an additional EPR feature with a striking non-monotonous temperature dependent shift of the g-factor is observed in terraced nanoparticles in the temperature range from 4K to room temperature. By linking the difference in the temperature dependence of the Mn2+ sextet intensity in cubic and terraced nanoparticles with the possible s-d exchange shift and enhanced Zeeman splitting we conclude that the novel EPR feature originates from the loosely trapped charge-compensating carriers at the abundant structural defects at the surface of terraced nanoparticles due to their exchange interaction with neighboring Mn2+ ions.

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