Electronic structure of sodium tungsten bronzes $Na_xWO_3$ by high-resolution angle-resolved photoemission spectroscopy
作者： S. Raj , H. Matsui , S. Souma , T. Sato , T. Takahashi
DOI: 10.1103/PHYSREVB.75.155116
关键词:
摘要: The electronic structure of sodium tungsten bronzes, $Na_xWO_3$, for full range x is investigated by high resolution angle-resolved photoemission spectroscopy (HR-ARPES). experimentally determined valence band has been compared with the results ab initio band-structure calculation. HR-ARPES spectra taken in both insulating and metallic phase $Na_xWO_3$ reveal origin metal-insulator transition (MIT) bronze system. In near-EF states are localized due to strong disorder caused random distribution $Na^+$ ions $WO_3$ lattice. While presence an impurity (level) induced Na doping often invoked explain state found at low concentrations, there no signature from our results. Due Anderson localization effect, a long-range Coulomb interaction conduction electrons; as result, system insulating. regime, near $E_F$ populated Fermi level shifts upward rigidly increasing electron (x). volume electronlike surface (FS) $\Gamma (X)$ point gradually increases concentration $W 5dt_2_g$ filling. A rigid shift give qualitatively good description FS evolution.
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