Abstract
The unusual dynamic nuclear polarization (DNP) phenomena at the center of an inhomogeneously broadened ESR line arising from a correlated ESR and NMR line broadening have been investigated for the case of inhomogeneous external magnetic fields. It was found that DNP experimental data obtained for the central ${\mathrm{Cr}}^{3+}$ ESR and $^{27}\mathrm{Al}$ NMR lines in a single crystal of ruby were consistent with the phenomenological model developed for the correlated ESR and NMR line broadenings arising from the strain and $c$-axis-variation effects. This result can be taken as a direct verification of the phenomenological model.
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