We report high-resolution angle-resolved photoemission spectroscopy on sodium tungsten bronzes, Nax WO3, which exhibit a metal-insulator transition as a function of x. We found that the near-EF states are localized in Nax WO3 (x ≤ 0.25) due to the strong disorder caused by the random distribution of Na+ ions in the WO3 lattice, which makes the system insulating. In the metallic regime we found that the rigid shift of band structure can explain the metallic Nax WO3 band structure with respect to Na doping.
- Anderson localization
- Angle-resolved photoemission spectroscopy
- Fermi surface
- Metal-insulator transition
- Na WO