Localized vs. delocalized character of charge carriers in LaAlO3/ SrTiO3 superlattices

Details Localized vs. delocalized character of charge carriers in LaAlO3/ SrTiO3 superlattices Localized vs. delocalized character of charge carriers in LaAlO3/ SrTiO3 superlattices

2010-11-21

arxiv.org/abs/1011.4674v1

Physics

Condensed Matter

Materials Science

14 pages, 3 figures

Scientific paper

Understanding the nature of electrical conductivity, superconductivity and magnetism between layers of oxides is of immense importance for the design of electronic devices employing oxide heterostructures. We demonstrate that resonant inelastic X-ray scattering can be applied to directly probe the carriers in oxide heterostructures. Our investigation on epitaxially grown LaAlO3/SrTiO3 superlattices unambiguously reveals the presence of both localized and delocalized Ti 3d carriers. These two types of carriers are caused by oxygen vacancies and electron transfer due to the polar discontinuity at the interface. This result allows explaining the reported discrepancy between theoretically calculated and experimentally measured carrier density values in LaAlO3/SrTiO3 heterostructures.

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