Abstract
The effect of varying oxygen stoichiometry on the spin dynamics and electronic state of a transition-metal ion in $^{57}\mathrm{doped}$ CuO has been studied. Oxygen deficiency results in an increase in the spin-lattice relaxation rate. The charge state of the iron shifts towards the ${\mathrm{Fe}}^{2+}$ state with increasing oxygen deficiency. The change in the charge state may be attributed to a dependence of charge-transfer energy and/or the transfer integral on oxygen vacancies. The present studies demonstrate some similarities in the behavior of CuO with that of high-temperature superconductors with respect to the effect of oxygen stoichiometry.
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