Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces

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Using a surface x-ray diffraction technique, we investigated the atomic structure of two types of interfaces between LaAlO{sub 3} and SrTiO{sub 3}, that is, p-type (SrO/AlO{sub 2}) and n-type (TiO{sub 2}/LaO) interfaces. Our results demonstrate that the SrTiO{sub 3} in the sample with the n-type interface has a large polarized region, while that with the p-type interface has a limited polarized region. In addition, the atomic intermixing was observed to extend deeper into STO substrate at the n-type interface than at the p-type. These differences result in different degrees of band bending, which likely contributes to the striking difference in ... continued below

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Bell, Christopher August 19, 2011.

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Using a surface x-ray diffraction technique, we investigated the atomic structure of two types of interfaces between LaAlO{sub 3} and SrTiO{sub 3}, that is, p-type (SrO/AlO{sub 2}) and n-type (TiO{sub 2}/LaO) interfaces. Our results demonstrate that the SrTiO{sub 3} in the sample with the n-type interface has a large polarized region, while that with the p-type interface has a limited polarized region. In addition, the atomic intermixing was observed to extend deeper into STO substrate at the n-type interface than at the p-type. These differences result in different degrees of band bending, which likely contributes to the striking difference in electrical conductivity between the two types of interfaces.

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  • Journal Name: Submitted to Physical Review Letters

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  • Report No.: SLAC-PUB-14503
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1022455
  • Archival Resource Key: ark:/67531/metadc830632

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  • August 19, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 12:48 p.m.

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Bell, Christopher. Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces, article, August 19, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc830632/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.