| Summary: | Nuclear spin ensembles in diamond are promising candidates for quantum sensing applications, including rotation sensing. Here we characterize the optically detected nuclear spin transitions associated with the ^{14}N nuclear spin within diamond nitrogen-vacancy (NV) centers. We observe that the contrast of the nuclear-spin-dependent fluorescence is comparable to the contrast of the NV electron-spin-dependent fluorescence. Using Ramsey spectroscopy, we investigate the temperature and magnetic field dependence of the nuclear spin transitions in the 77.5–420 K and 350–675 G range, respectively. The nuclear quadrupole coupling constant Q was found to vary with temperature T, yielding d|Q|/dT=−35.0(2)Hz/K at T=297K. The temperature and magnetic field dependencies reported here are important for quantum sensing applications such as rotation sensing and potentially for applications in quantum information processing.
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