Electronic structure of early transition metal oxides, $Ca_{1-x}Sr_{x}VO_{3}$ and $La_{1-x}Ca_{x}VO_{3}$: What can we learn from photoelectron spectroscopy

Maita, Kalobaran and Unnikrishnan, Manju and Inoue, IH and Sarma, DD (2005) Electronic structure of early transition metal oxides, $Ca_{1-x}Sr_{x}VO_{3}$ and $La_{1-x}Ca_{x}VO_{3}$: What can we learn from photoelectron spectroscopy. In: Thin Solid Films, 486 (1-2). pp. 162-169.

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Abstract

Photoemission spectroscopy offers the unique possibility of mapping out the electronic structure of the occupied electron states. However, the extreme surface sensitivity of this technique ensures that only the surface and the near-surface regions of any sample are probed. An important question arises in this context-Is the electronic structure of the surface region the same as that of the bulk? We address this issue using two different series of vanadium oxides, $Ca_{1-x}Sr_{x}VO_{3}$ and $La_{1-x}Ca_{x}VO_{3}$. Our results clearly establish that the electronicstructure of the surface region is drastically different from that of the bulk in both these cases. We provide a method to separate the two contributions: one arising from the near-surface region and the other representative of the bulk. This separation allows us to deduce some very unusual behaviors of the electronic structures in these systems.

Item Type:	Journal Article
Publication:	Thin Solid Films
Publisher:	Elsevier Science SA
Additional Information:	Copyright for this article belongs to Elsevier.
Keywords:	Electron correlation;Surface and interface states;Photoelectron spectroscopy
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	14 Mar 2007
Last Modified:	19 Sep 2010 04:19
URI:	http://eprints.iisc.ac.in/id/eprint/3578

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