Abstract
Dynamic nuclear polarization DNP effects are observed of 67Zn I=5/2 nuclear spins in ZnO nanoparticles
and of 1H I=1/2 spins of the Zn OH 2 capping layer. The almost complete polarization of these
nuclear spins is achieved by saturating the electron paramagnetic resonance transition of the shallow interstitial
Li donor present in the ZnO nanoparticles. The remarkable aspect is that this DNP is caused by an Overhauser
mechanism although the phonons mediating the polarization process do not fit into the nanoparticles. An
explanation of this DNP process is presented, and it is shown that this allows for a measurement of the
distribution of phonon modes in the nanoparticles. The enhancement of the nuclear polarization also opens the
possibility to study semiconductor nanostructures with NMR techniques.
Original language | English |
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Article number | 165316 |
Number of pages | 6 |
Journal | Physical review. B, Condensed matter and materials physics |
Volume | 79 |
Issue number | 16 |
DOIs | |
Publication status | Published - 2009 |