Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3 /SrTiO3

Scientific Reports
Ming-Shiu TsaiM-W Chu

Abstract

The interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted enormous interests due to its rich physical phenomena, such as metallic nature, magnetism and superconductivity. In this work, we report our experimental investigations on the influence of the LAO stoichiometry to the metallic interface. Taking advantage of the oxide molecular beam epitaxy (MBE) technique, a series of high quality LAO films with different nominal La/Al ratios and LAO thicknesses were grown on the TiO2-terminated STO substrates, where systematic variations of the LAO lattice constant and transport property were observed. In particular, the sheet density can be largely reduced by nearly an order of magnitude with merely about 20% increase in the nominal La/Al ratio. Our finding provides an effective method on tuning the electron density of the two-dimensional electron liquid (2DEL) at the LAO/STO interface.

References

Jun 5, 2007·Nature Materials·A BrinkmanH Hilgenkamp
Aug 4, 2007·Science·N ReyrenJ Mannhart
Aug 7, 2007·Physical Review Letters·Wolter SiemonsMalcolm R Beasley
Nov 13, 2007·Physical Review Letters·P R WillmottY Yacoby
Dec 5, 2008·Nature·A D CavigliaJ-M Triscone
Apr 28, 2009·Physical Review Letters·Rossitza Pentcheva, Warren E Pickett
Aug 27, 2011·Physical Review Letters·D A DikinV Chandrasekhar
Feb 2, 2013·Physical Review Letters·Z SalmanR F Kiefl
May 28, 2013·Physical Review Letters·E BreckenfeldL W Martin
Jun 4, 2013·Nature Materials·J-S LeeC-C Kao
Aug 24, 2013·Nature Communications·M P WarusawithanaD G Schlom

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Methods Mentioned

BETA
electron diffraction
quartz crystal microbalance
atomic force microscopy
X-ray
AFM

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