Panaccione G, Altarelli M, Fondacaro A, Georges A, Huotari S, Lacovig P, Lichtenstein A, Metcalf P, Monaco G, Offi F, Paolasini L, Poteryaev A, Tjernberg O, Sacchi M
TASC Laboratory, INFM-CNR, in Area Science Park, S.S.14, Km 163.5, I-34012 Trieste, Italy.
Phys Rev Lett. 2006 Sep 15;97(11):116401. doi: 10.1103/PhysRevLett.97.116401. Epub 2006 Sep 11.
We have measured hard x-ray photoemission spectra of pure vanadium sesquioxide (V(2)O(3)) across its metal-insulator transition. We show that, in the metallic phase, a clear correlation exists between the shakedown satellites observed in the vanadium 2p and 3p core-level spectra and the coherent peak measured at the Fermi level. Comparing experimental results and dynamical mean-field theory calculations, we estimate the Hubbard energy U in V(2)O(3) (4.20+/-0.05 eV). From our bulk-sensitive photoemission spectra we infer the existence of a critical probing depth for investigating electronic properties in strongly correlated solids.
我们测量了纯三氧化二钒（V₂O₃）在其金属 - 绝缘体转变过程中的硬X射线光电子能谱。我们表明，在金属相中，钒2p和3p芯能级谱中观察到的弛豫卫星峰与在费米能级处测量的相干峰之间存在明显的相关性。通过比较实验结果和动态平均场理论计算，我们估计了V₂O₃中的哈伯德能量U（4.20±0.05电子伏特）。从我们的体敏感光电子能谱中，我们推断出在研究强关联固体中的电子性质时存在一个临界探测深度。
