Abstract
An -type center with axial 〈001〉 symmetry has been studied by electron nuclear double resonance (ENDOR) in the microwave X and Q bands. The center is produced only after irradiation with x or γ rays at 80 K of crystals grown in a atmosphere. It has a ground state with spin As shown by the correlated analysis of the ENDOR data and electron paramagnetic resonance superhyperfine structure, the ion is situated in the center of a tetragonally compressed cube of eight nearest ions. The simplest model of the center, compatible with the magnetic resonance results, consists of an interstitial ion with two substitutional monovalent cations, very likely ions, in two opposite nearest-neighbor sites along the tetragonal axis of the center.
- Received 18 December 2000
DOI:https://doi.org/10.1103/PhysRevB.64.024405
©2001 American Physical Society