Ion blocking dip shape analysis around a LaAlO3/SrTiO3 interface

We present an analysis of the widths of the blocking dips obtained in MEIS ion blocking experiments of two LaAlO3/SrTiO3 heterostructures differing in their LaAlO3 layer thicknesses. In the LaAlO3 layers, the observed blocking dips are larger than expected. This enlargement is the result of the supe...

Full description

Saved in:
Bibliographic Details
Published inNuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 423; pp. 67 - 71
Main Authors Jalabert, D., Zaid, H., Berger, M.H., Fongkaew, I., Lambrecht, W.R.L., Sehirlioglu, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.05.2018
Subjects
Cation vacancy
Ion blocking
LaAlO3/SrTiO3interface
MEIS
Real-space structural analysis
Cation vacancy
Ion blocking
MEIS
Real-space structural analysis
LaAlO3/SrTiO3interface
Online AccessGet full text

Cover

More Information
Summary:We present an analysis of the widths of the blocking dips obtained in MEIS ion blocking experiments of two LaAlO3/SrTiO3 heterostructures differing in their LaAlO3 layer thicknesses. In the LaAlO3 layers, the observed blocking dips are larger than expected. This enlargement is the result of the superposition of individual dips at slightly different angular positions revealing a local disorder in the atomic alignment, i.e., layer buckling. By contrast, in the SrTiO3 substrate, just below the interface, the obtained blocking dips are thinner than expected. This thinning indicates that the blocking atoms stand at a larger distance from the scattering center than expected. This is attributed to an accumulation of Sr vacancies at the layer/substrate interface which induces lattice distortions shifting the atoms off the scattering plane.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2018.03.010