Electron-spectroscopic investigation of the metal-insulator transition in $Sr_2Ru_1_-_xTi_xO_4$ (x=0–0.6)

Ray, Sugata and Sarma, DD (2006) Electron-spectroscopic investigation of the metal-insulator transition in $Sr_2Ru_1_-_xTi_xO_4$ (x=0–0.6). In: Physical Review B: Condensed Matter and Materials Physics, 73 (16). pp. 165105-1.

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Abstract

We investigate the nature and origin of the metal-insulator transition in $Sr_2Ru_1_-_xTi_xO_4$ as a function of increasing Ti content (x). Employing detailed core, valence, and conduction band studies with x-ray and ultraviolet photoelectron spectroscopies along with Bremsstrahlung isochromat spectroscopy, it is shown that a hard gap opens up for Ti content$\geq$ 0.2, while compositions with x<0.2 exhibit finite intensity at the Fermi energy, $E_F$. This establishes that the metal-insulator transition in this homovalent substituted series of compounds is driven by Coulomb interaction leading to the formation of a Mott gap, in contrast to transitions driven by disorder effects or band filling.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to Physical Review B.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 May 2006
Last Modified:	19 Sep 2010 04:27
URI:	http://eprints.iisc.ac.in/id/eprint/6948

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