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Analysis of Electronic and Structural Properties of Surfaces and Interfaces Based on LaAlO\( _{3} \) and SrTiO\( _{3}\)

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Abstract

Recently, it was established that a two-dimensional electron system can arise at the interface between two oxide insulators LaAlO\(_{3}\) and SrTiO\(_{3}\). This paradigmatic example exhibits metallic behaviors and magnetic properties between non-magnetic and insulating oxides. Despite a huge amount of theoretical and experimental work a thorough understanding is yet to be achieved. We analyzed the structural deformations of a LaAlO\( _{3} \) (001) slab induced by hydrogen adatoms and oxygen vacancies at its surface by means of density functional theory. Moreover, we investigated the influence of surface reconstruction on the density of states and determined the change of the local density of states at the Fermi level with increasing distance from the surface for bare LaAlO\( _{3} \) and for a conducting LaAlO\(_{3}\)/SrTiO\(_{3}\) interface. In addition, the Al-atom displacements and distortions of the TiO\(_6\)-octahedra were estimated.

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Acknowledgments

The reported study was supported by the Supercomputing Center of Lomonosov Moscow State University with support of the Russian Government Program of Competitive Growth of Kazan Federal University and of the DFG Sonderforschungsbereich TRR 80. The work of A.G. Kiiamov was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities. The authors acknowledge helpful discussion with D. Juraschek, A. Petrova, Kate Reidy and Jessica Weitbretch.

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Authors and Affiliations

  1. Institute of Physics, Kazan Federal University, Kremlyovskaya St. 18, Kazan, Russia, 420008

    I. I. Piyanzina, Yu. V. Lysogorskiy, I. I. Varlamova, A. G. Kiiamov, O. V. Nedopekin & D. A. Tayurskii

  2. EP VI and Center for Electronic Correlations and Magnetism, Universität Augsburg, Universitätsstraße 1, 86135, Augsburg, Germany

    I. I. Piyanzina & T. Kopp

  3. Materials Design SARL, 18 rue de Saisset, 92120, Montrouge, France

    V. Eyert

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  1. I. I. Piyanzina
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  2. Yu. V. Lysogorskiy
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  3. I. I. Varlamova
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  4. A. G. Kiiamov
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  8. D. A. Tayurskii
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Correspondence to I. I. Piyanzina.

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Piyanzina, I.I., Lysogorskiy, Y.V., Varlamova, I.I. et al. Analysis of Electronic and Structural Properties of Surfaces and Interfaces Based on LaAlO\( _{3} \) and SrTiO\( _{3}\) . J Low Temp Phys 185, 597–602 (2016). https://doi.org/10.1007/s10909-016-1483-2

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  • DOI: https://doi.org/10.1007/s10909-016-1483-2

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