@article{oai:nagoya.repo.nii.ac.jp:00030467,
 author = {Shimizu, Yasuhiro and Jin-no, Takaaki and Iwase, Fumitatsu and Itoh, Masayuki and Ueda, Yutaka},
 issue = {24},
 journal = {Physical Review B},
 month = {Jun},
 note = {Metal-insulator transition was microscopically investigated by orbital-resolved nuclear magnetic resonance (OR-NMR) spectroscopy in a single crystal of vanadium dioxide VO2. Observations of the anisotropic 51V Knight shift and the nuclear quadrupole frequency allow us to evaluate orbital-dependent spin susceptibility and d orbital occupations. The result is consistent with the degenerated t2g orbitals in a correlated metallic phase and the d orbital ordering in a nonmagnetic insulating phase. The predominant orbital pointing along the chain facilitates a spin-singlet formation triggering metal-insulator transition. The asymmetry of magnetic and electric hyperfine tensors suggests the d orbital reformation favored by a low-symmetry crystal field, forming a localized molecular orbital. The result highlights the cooperative electron correlation and electron-phonon coupling in Mott transition with orbital degrees of freedom.},
 title = {Occupation switching of d orbitals in vanadium dioxide probed via hyperfine interactions},
 volume = {101},
 year = {2020}
}