Abstract
We have made $^{53}\mathrm{Cr}$ NMR measurements on polycrystalline and single-crystalline film samples to study the local electronic state of a half-metallic ferromagnet ${\mathrm{CrO}}_{2}$ which has the rutile structure with one crystallographically equivalent Cr site. We observe two kinds of $^{53}\mathrm{Cr}$ NMR spectra in the ferromagnetic state of both the samples. An analysis on the hyperfine field shows the presence of two Cr sites with different orbital occupancies, suggesting that a local orbital order takes place with breaking the local symmetry in the rutile structure. This may be ascribed to the negative charge transfer between chromium and oxygen ions.
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