Abstract
From a combination of NQR, NMR and AFNMR spectra in Cu1-xLixO information on the electric and magnetic electron-nucleus interactions is obtained. In particular, it is argued that Li+ enters the CuO lattice up to x approximately=4%, with a relatively small effect on the Neel temperature TN. 63Cu NQR and AFNMR, and 7Li NMR spin-lattice relaxation measurements are used to study the spin dynamics in the paramagnetic (PA) and in the antiferromagnetic (AF) phase and the effects associated with the creation of holes upon lithium doping. The Li doping modifies in a dramatic way the spin fluctuations in the AF phase. These effects are related to the fluctuations in the local Cu2+ spin configuration due to the diffusional motion of the extra holes in the electronic bands. A satisfactory explanation of the temperature and frequency dependences of Li relaxation rates is given in terms of a correlation time tau h for the hole motion controlled by an energy gap E(x) and quantitative information on tau h and E(x) are thus derived.
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