Imperial College London

Professor David W. McComb

Faculty of EngineeringDepartment of Materials

Adjunct Professor
 
 
 
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Contact

 

+44 (0)20 7594 6750d.mccomb Website

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bagués:2018:10.1002/adfm.201704437,
author = {Bagués, N and Santiso, J and Esser, BD and Williams, REA and McComb, DW and Konstantinovic, Z and Balcells, L and Sandiumenge, F},
doi = {10.1002/adfm.201704437},
journal = {Advanced Functional Materials},
title = {The Misfit Dislocation Core Phase in Complex Oxide Heteroepitaxy},
url = {http://dx.doi.org/10.1002/adfm.201704437},
volume = {28},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Misfit dislocations form self-organized nanoscale linear defects exhibiting their own distinct structural, chemical, and physical properties which, particularly in complex oxides, hold a strong potential for the development of nanodevices. However, the transformation of such defects from passive into potentially active functional elements necessitates a deep understanding of the particular mechanisms governing their formation. Here, different atomic resolution imaging and spectroscopic techniques are combined to determine the complex structure of misfit dislocations in the perovskite type La0.67Sr0.33MnO3/LaAlO3 heteroepitaxial system. It is found that while the position of the film–substrate interface is blurred by cation intermixing, oxygen vacancies selectively accumulate at the tensile region of the dislocation strain field. Such accumulation of vacancies is accompanied by the reduction of manganese cations in the same area, inducing chemical expansion effects, which partly accommodate the dislocation strain. The formation of oxygen vacancies is only partially electrically compensated and results in a positive net charge q ≈ +0.3 ± 0.1 localized in the tensile region of the dislocation, while the compressive region remains neutral. The results highlight a prototypical core model for perovskite-based heteroepitaxial systems and offer insights for predictive manipulation of misfit dislocation properties.
AU - Bagués,N
AU - Santiso,J
AU - Esser,BD
AU - Williams,REA
AU - McComb,DW
AU - Konstantinovic,Z
AU - Balcells,L
AU - Sandiumenge,F
DO - 10.1002/adfm.201704437
PY - 2018///
SN - 1616-301X
TI - The Misfit Dislocation Core Phase in Complex Oxide Heteroepitaxy
T2 - Advanced Functional Materials
UR - http://dx.doi.org/10.1002/adfm.201704437
VL - 28
ER -