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Coexistence of two different Cr ions by self-doping in half-metallic CrO2 nanorods
Jeong Hyun Shim1, Soonchil Lee, Joonghoe Dho
1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Abstract:
We investigated the physical properties of Cr ions in half-metallic CrO(2) using 53Cr nuclear magnetic resonance (NMR). The 53Cr NMR spectra showed two peaks with a similar intensity instead of the single peak anticipated from a uniform single valence Cr(+4). Both Cr peaks exhibited a strong anisotropy in the hyperfine field and similar values in the enhancement factor and T2 relaxation time. These results suggest the coexistence of two different Cr ions (provisionally, Cr(+4 +/- 1/3)) by a self-doping effect, which is a likely origin of the metallic ferromagnetism in CrO(2).
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