Site-Selective Electron Nuclear Double Resonance in the Exchange-Narrowed Regime of the ESR in Conducting Solids
✍ Scribed by G. Denninger; K. Baldenhofer; R. Geßler; L. Binet; D. Gourier
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 164 KB
- Volume
- 148
- Category
- Article
- ISSN
- 1090-7807
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✦ Synopsis
Electron nuclear magnetic double resonance on conduction electrons reveals the hyperfine interaction hidden by the fast electron spin exchange. We used the Overhauser shift technique to investigate the electron spin density of the conduction band of gallium oxide, -Ga 2 O 3 . Due to the monoclinic structure, the conduction band of -Ga 2 O 3 is anisotropic and it is dominated by contributions from the two nonequivalent Ga sites. The large quadrupole couplings of the two gallium isotopes 69 Ga and 71 Ga (both with I ؍ 3/2) are completely resolved in our double-resonance experiments. This resolved quadrupole interaction allows the determination of the electric field gradients at both gallium sites with high precision and high sensitivity. The resolved quadrupole splitting is the key to the site-selected determination of the hyperfine interaction. The concepts behind these double-resonance techniques are rather general and should be applicable in similar semiconductor systems.