论文标题
$ D $轨道的职业转换通过二氧化钒中的超精美相互作用探测
Occupation switching of $d$ orbitals probed via hyperfine interactions in vanadium dioxide
论文作者
论文摘要
通过轨道分辨的核磁共振（OR-NMR）光谱在二氧化钒vo $ _2 $的单个晶体中，通过轨道分辨的核磁共振（OR-NMR）光谱进行了微观研究。对各向异性$^{51} $ v骑士移动和核四极频率的观察使我们能够评估依赖轨道依赖性的旋转易感性和$ d $ d $轨道的职业。结果与相关的金属阶段中的退化$ t_ {2g} $轨道一致，在非磁性绝缘阶段中的$ d $轨道订购。沿链条指向的主要轨道促进了旋转的旋转形成，触发金属绝缘体过渡。磁性和电力超细张量的不对称性表明，低对称晶体偏爱的$ D $轨道改革，形成了局部分子轨道。结果突出了莫特过渡与轨道自由度的合作电子相关性和电子音波耦合。
Metal-insulator transition was microscopically investigated by orbital-resolved nuclear magnetic resonance (OR-NMR) spectroscopy in a single crystal of vanadium dioxide VO$_2$. Observations of the anisotropic $^{51}$V 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 $t_{2g}$ 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.
