Photoelectron spectromicroscopy study of metal-insulator transition in NaxWO3

Paul, Sanhita and Ghosh, Anirudha and Dudin, Pavel and Barinov, Alexei and Chakraborty, Anirban and Ray, Sugata and Sarma, DD and Oishi, Shuji and Raj, Satyabrata (2013) Photoelectron spectromicroscopy study of metal-insulator transition in NaxWO3. In: Solid State Communications, 166 . pp. 66-69.

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Abstract

We have investigated the validity of percolation model, which is quite often invoked to explain the metal-insulator transition in sodium tungsten bronzes, NaxWO(3) by photoelectron spectromicroscopy. The spatially resolved direct spectromicroscopic probing on both the insulating and metallic phases of high quality single crystals of NaxWO(3) reveals the absence of any microscopic inhomogeneities embedded in the system within the experimental limit. Neither any metallic domains in the insulating host nor any insulating domains in the metallic host have been found to support the validity of percolation model to explain the metal-insulator transition in NaxWO(3). The possible origin of insulating phase in NaxWO(3) is due to the Anderson localization of all the states near E-F. The localization occurs because of the strong disorder arising from random distribution of Na+ ions in the WO3 lattice.

Item Type:	Journal Article
Publication:	Solid State Communications
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Insulators; Phase Transitions; Photoelectron Spectroscopies; Synchrotron Radiation
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 Sep 2013 17:33
Last Modified:	19 Sep 2013 17:33
URI:	http://eprints.iisc.ac.in/id/eprint/47216

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