# Metal–insulator transition in sodium tungsten bronzes, $Na_xWO_3$, studied by angle-resolved photoemission spectroscopy

Raj, S and Hashimoto, D and Matsui, H and Souma, S and Sato, T and Takahashi, T and Ray, S and Chakraborty, A and Sarma, DD and Mahadevan, P and Oishi, S and McCarroll, WH and Greenblatt, M (2007) Metal–insulator transition in sodium tungsten bronzes, $Na_xWO_3$, studied by angle-resolved photoemission spectroscopy. In: Journal of Magnetism and Magnetic Materials, 310 (2). e231-e233.

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## Abstract

We report high-resolution angle-resolved photoemission spectroscopy on sodium tungsten bronzes, $NaxWO_3$, which exhibit a metal–insulator transition as a function of x. We found that the near-$E_F$ states are localized in $Na_xWO_3$ $(x \leq 0:25)$ due to the strong disorder caused by the random distribution of $Na^+$ ions in the $WO_3$ lattice, which makes the system insulating. In the metallic regime we found that the rigid shift of band structure can explain the metallic $Na_xWO_3$ band structure with respect to Na doping.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Metal–insulator transition;Angle-resolved photoemission spectroscopy;Anderson localization;Fermi surface;NaxWO3 Division of Chemical Sciences > Solid State & Structural Chemistry Unit 28 Sep 2007 19 Sep 2010 04:39 http://eprints.iisc.ernet.in/id/eprint/11908