Probing Surface and Bulk Electrochemical Processes on the LaAlO3-SrTiO3 Interface

Kumar, Amit and Arruda, Thomas M. and Kim, Yunseok and Ivanov, Ilia N. and Jesse, Stephen and Bark, Chung W. and Bristowe, Nicholas C. and Artacho, Emilio and Littlewood, Peter B. and Eom, Chang-Beom and Kalinin, Sergei V. (2012) Probing Surface and Bulk Electrochemical Processes on the LaAlO3-SrTiO3 Interface. ACS NANO, 6 (5). pp. 3841-3852. ISSN 1936-0851. (doi:https://doi.org/10.1021/nn204960c) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1021/nn204960c

Abstract

Local electrochemical phenomena on the surfaces of the LaAlO3-SrTiO3 heterostructure are explored using unipolar and bipolar dynamic electrochemical strain microscopy (D-ESM). The D-ESM suggests the presence of at least two distinct electrochemical processes, Including fast reversible low-voltage process and slow high-voltage process. The latter process Is associated with static surface deformations In the sub-nanometer regime. These behaviors are compared with Kelvin probe force microscopy hysteresis data. The possible origins of observed phenomena are discussed, and these studies suggest that charge-writing behavior in LAO-STO includes a strong surface/bulk electrochemical component and is more complicated than simple screening by surface adsorbates.

Item Type: Article
Uncontrolled keywords: electrochemical; dynamic strain; microscopy; charge writing
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Nicholas Bristowe
Date Deposited: 21 Feb 2017 14:55 UTC
Last Modified: 22 Feb 2017 15:24 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60259 (The current URI for this page, for reference purposes)
Bristowe, Nicholas C.: https://orcid.org/0000-0003-1286-8440
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