Suppression of the critical thickness threshold for conductivity at the LaAlO /SrTiO interface
Nature Communications, ISSN: 2041-1723, Vol: 5, Issue: 1, Page: 4291
2014
- 56Citations
- 125Captures
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Metrics Details
- Citations56
- Citation Indexes56
- 56
- CrossRef53
- Captures125
- Readers125
- 125
Article Description
Perovskite materials engineered in epitaxial heterostructures have been intensely investigated during the last decade. The interface formed by an LaAlO thin film grown on top of a TiO-terminated SrTiO substrate hosts a two-dimensional electronic system and has become the prototypical example of this field. Although controversy exists regarding some of its physical properties and their precise origin, it is universally found that conductivity only appears beyond an LaAlO thickness threshold of four unit cells. Here, we experimentally demonstrate that this critical thickness can be reduced to just one unit cell when a metallic film of cobalt is deposited on top of LaAlO. First-principles calculations indicate that Co modifies the electrostatic boundary conditions and induces a charge transfer towards the Ti 3d bands, supporting the electrostatic origin of the electronic system at the LaAlO /SrTiO interface. Our results expand the interest of this low-dimensional oxide system from in-plane to perpendicular transport and to the exploration of elastic and inelastic tunnel-type transport of (spin-polarized) carriers. © 2014 Macmillan Publishers Limited. All rights reserved.
Bibliographic Details
Springer Science and Business Media LLC
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