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Gate-tunable superconductivity at SrTiO3 surface realized by Al layer evaporation.
- Source :
- Journal of Applied Physics; 2018, Vol. 124 Issue 21, pN.PAG-N.PAG, 6p, 1 Diagram, 3 Graphs
- Publication Year :
- 2018
-
Abstract
- Electronic properties of low dimensional superconductors are determined by many-body-effects. This physics has been studied traditionally with superconducting thin films and in recent times with two-dimensional electron gases (2DEGs) at oxide interfaces. In this work, we show that a superconducting 2DEG can be generated by simply evaporating a thin layer of metallic Al under ultrahigh vacuum on a SrTiO 3 crystal, whereby Al oxidizes into amorphous insulating alumina, doping the SrTiO 3 surface with oxygen vacancies. The superconducting critical temperature of the resulting 2DEG is found to be tunable with a gate voltage with a maximum value of 360 mK. A gate-induced switching between superconducting and resistive states is demonstrated. Compared to conventionally-used pulsed-laser deposition, our work simplifies to a large extent the process of fabricating oxide-based superconducting 2DEGs. It will make such systems accessible to a broad range of experimental techniques useful to understand low-dimensional phase transitions and complex many-body-phenomena in electronic systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 124
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 133463123
- Full Text :
- https://doi.org/10.1063/1.5049363