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Synthesis and electrical properties of cubic $Na_{x}WO_{3}$ thin films across the metal-insulator transition

Lekshmi, Chaitanya I and Hegde, MS (2005) Synthesis and electrical properties of cubic $Na_{x}WO_{3}$ thin films across the metal-insulator transition. In: Materials Research Bulletin, 40 (9). pp. 1443-1450.

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Abstract

Highly oriented (1 0 0) $Na_{x}WO_{3}$ thin films were fabricated in the composition range 0.1 \leq x \leq 0.46 by pulsed laser deposition technique. The films showed transition from metallic to insulating behaviour at a critical composition between x = 0.15 and 0.2. The pseudo-cubic symmetry of $Na_{x}WO_{3}$ thin films across the transition regionis desirable for understanding the composition controlled metal-insulator transition in the absence of any structural phase transformation. The electrical transport properties exhibited by these films across the transition regime were investigated. While the resistivity varied as T-2 at low temperatures in the metallic regime, avariable range hopping conduction was observed for the insulating samples. For metallic compositions, a non-linear dependence of resistivity in temperature was also observed from 300 to 7 K, whose exponent varied with the composition of the film.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: A. Thin films;B. Laser deposition;D. Crystal structure;D. Electrical properties
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 20 Sep 2005
Last Modified: 19 Sep 2010 04:20
URI: http://eprints.iisc.ernet.in/id/eprint/3671

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