Imperial College London

ProfessorMaryRyan

Faculty of EngineeringDepartment of Materials

Vice-Dean (Research), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6755m.p.ryan

 
 
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Location

 

B338Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pramana:2017:10.1038/srep43721,
author = {Pramana, SS and Cavallaro, A and Qi, J and Nicklin, CL and Ryan, MP and Skinner, SJ},
doi = {10.1038/srep43721},
journal = {Scientific Reports},
title = {Understanding surface structure and chemistry of single crystal lanthanum aluminate},
url = {http://dx.doi.org/10.1038/srep43721},
volume = {7},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The surface crystallography and chemistry of a LaAlO3 single crystal, a material mainly used as a substrate to deposit technologically important thin films (e.g. for superconducting and magnetic devices), was analysed using surface X-ray diffraction and low energy ion scattering spectroscopy. The surface was determined to be terminated by Al-O species, and was significantly different from the idealised bulk structure. Termination reversal was not observed at higher temperature (600°C) and chamber pressure of 10-10 Torr, but rather an increased Al-O occupancy occurred, which was accompanied by a larger outwards relaxation of Al from the bulk positions. Changing the oxygen pressure to 10-6 Torr enriched the Al site occupancy fraction at the outermost surface from 0.245(10) to 0.325(9). In contrast the LaO, which is located at the next sub-surface atomic layer, showed no chemical enrichment and the structural relaxation was lower than for the top AlO2 layer. Knowledge of the surface structure will aid the understanding of how and which type of interface will be formed when LaAlO3 is used as a substrate as a function of temperature and pressure, and so lead to improved design of device structures.
AU - Pramana,SS
AU - Cavallaro,A
AU - Qi,J
AU - Nicklin,CL
AU - Ryan,MP
AU - Skinner,SJ
DO - 10.1038/srep43721
PY - 2017///
SN - 2045-2322
TI - Understanding surface structure and chemistry of single crystal lanthanum aluminate
T2 - Scientific Reports
UR - http://dx.doi.org/10.1038/srep43721
UR - http://hdl.handle.net/10044/1/44254
VL - 7
ER -