UNIGE document Scientific Article
previous document  unige:23534  next document
add to browser collection
Title

Tunable conductivity threshold at polar oxide interfaces

Authors
Reinle-Schmitt, M.L.
Cancellieri, C.
Fontaine, D.
Medarde, M.
Pomjakushina, E.
Schneider, C.W.
show hidden authors show all authors [1 - 11]
Published in Nature Communications. 2012, vol. 3, p. 932
Abstract The physical mechanisms responsible for the formation of a two-dimensional electron gas at the interface between insulating SrTiO3 and LaAlO3 have remained a contentious subject since its discovery in 2004. Opinion is divided between an intrinsic mechanism involving the build-up of an internal electric potential due to the polar discontinuity at the interface between SrTiO3 and LaAlO3, and extrinsic mechanisms attributed to structural imperfections. Here we show that interface conductivity is also exhibited when the LaAlO3 layer is diluted with SrTiO3, and that the threshold thickness required to show conductivity scales inversely with the fraction of LaAlO3 in this solid solution, and thereby also with the layer's formal polarization. These results can be best described in terms of the intrinsic polar-catastrophe model, hence providing the most compelling evidence, to date, in favour of this mechanism.
Identifiers
Full text
Structures
Research group Groupe Triscone
Citation
(ISO format)
REINLE-SCHMITT, M.L. et al. Tunable conductivity threshold at polar oxide interfaces. In: Nature Communications, 2012, vol. 3, p. 932. https://archive-ouverte.unige.ch/unige:23534

297 hits

7 downloads

Update

Deposited on : 2012-10-24

Export document
Format :
Citation style :