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δ-doped LaAlO3-SrTiO3 interface: Electrical transport and characterization of the interface potential

Here we investigate LaAlO_3-SrTiO_3 heterostructure withδ-doping of the interface by LaMnO_3 at less than one monolayer. This doping strongly inhibits the formation of mobile electron layer at the interface. This results in 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 effect of doping and detailed temperature dependence is analyzed in terms of model parameters and the weak-scattering theory. The large enhancement of thermopower is attributed to the increased spin and orbital entropy originating from the LaMnO_3 mono-layer.

preprint2013arXivOpen access
A. RastogiS. TiwariJ. J. PulikkotilZ. HossainD. KumarR. C. Budhani
cond-mat.str-elcond-mat.mtrl-sci
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A. RastogiS. TiwariJ. J. PulikkotilZ. HossainD. KumarR. C. Budhani

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