Rastogi, A. and Tiwari, S. and Pulikkotil, J. J. and Hossain, Z. and Kumar, D. and Budhani, R. C. (2014) delta-doped LaAlO3-SrTiO3 interface: Electrical transport and characterization of the interface potential. EPL, 106 (5). ISSN 0295-5075

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Abstract

Here we investigate the LaAlO3-SrTiO3 heterostructure with delta-doping of the interface by LaMnO3 at less than one monolayer. This doping strongly inhibits the formation of a mobile electron layer at the interface. This results in a giant increase of the resistance and the thermopower of the heterostructure. Several aspects of this phenomena are investigated. A model to calculate the carrier concentration is presented and the effect of doping with detailed temperature dependence is analyzed in terms of model parameters and weak-scattering theory. The large enhancement of the thermopower is attributed to the increased spin and orbital entropy originating from the LaMnO3 monolayer.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S European Physical Society.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	18 Sep 2015 11:15
Last Modified:	18 Sep 2015 11:15
URI:	http://npl.csircentral.net/id/eprint/1226

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