NUCLEAR QUADRUPOLE RESONANCE STUDIES IN CUPROUS OXIDE
- 1 October 1966
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 44 (10), 2315-2328
- https://doi.org/10.1139/p66-189
Abstract
The 63Cu and 65Cu pure nuclear quadrupole resonance transitions have been investigated in a powder sample of cuprous oxide from 4.2 °K to 298 °K. The observed decrease in resonance frequency with increasing temperature is discussed in terms of the theory developed by Bayer and Kushida. The spin-lattice relaxation-time measurements above 20.4 °K are interpreted in terms of a coupling of the lattice phonons to the nuclear quadrupole moments via two phonon Raman processes. A rough estimate of the Debye temperature is made. The measured relaxation times at 4.2 °K are an order of magnitude shorter than predicted by the spin-phonon mechanism. Two other mechanisms are discussed: (i) a coupling of the spins to torsional oscillations; (ii) a coupling of the spins to paramagnetic impurities.Keywords
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