Origin of Charge Density at LaAlO3 on SrTiO3 Heterointerfaces: Possibility of Intrinsic Doping

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Siemons, Wolter and Koster, Gertjan and Yamamoto, Hideki and Harrison, Walter A. and Lucovsky, Gerald and Geballe, Theodore H. and Blank, Dave H.A. and Beasley, Malcolm R. (2007) Origin of Charge Density at LaAlO3 on SrTiO3 Heterointerfaces: Possibility of Intrinsic Doping. Physical Review Letters, 98 (19). p. 196802. ISSN 0031-9007

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Abstract:As discovered by Ohtomo and Hwang, a large sheet charge density with high mobility exists at the interface between SrTiO3 and LaAlO3. Based on transport, spectroscopic, and oxygen-annealing experiments, we conclude that extrinsic defects in the form of oxygen vacancies introduced by the pulsed laser deposition process used by all researchers to date to make these samples is the source of the large carrier densities. Annealing experiments show a limiting carrier density. We also present a model that explains the high mobility based on carrier redistribution due to an increased dielectric constant.
Item Type:Article
Copyright:© 2007 American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/59119
Official URL:http://dx.doi.org/10.1103/PhysRevLett.98.196802
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Metis ID: 242616