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Electrical and structural properties of ABO3/SrTiO3 interfaces
MC2, Chalmers tekniska högskola.
MC2, Chalmers tekniska högskola.
MC2, Chalmers tekniska högskola.
Jönköping University, School of Education and Communication, HLK, School Based Research, Sustainable Development and Science education.
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2012 (English)In: MRS Online Proceedings Library, vol 1454: 2012 MRS Spring Meeting - Symposium HH – Nanocomposites, Nanostructures and Heterostructures of Correlated Oxide Systems, Warrendale, Pa.: Materials Research Society, 2012, 167-172 p.Conference paper, Published paper (Refereed)
Abstract [en]

Electrical transport and microstructure of interfaces between nm-thick films of various perovskite oxides grown by pulsed laser deposition (PLD) on TiO2- terminated SrTiO3 (STO) substrates are compared. LaAlO3/STO and KTaO3/STO interfaces become quasi-2DEG after a critical film thickness of 4 unit cell layers. The conductivity survives long anneals in oxygen atmosphere. LaMnO3/STO interfaces remain insulating for all film thicknesses and NdGaO3/STO interfaces are conducting but the conductivity is eliminated after oxygen annealing. Medium-energy ion spectroscopy and scanning transmission electron microscopy detect cationic intermixing within several atomic layers from the interface in all studied interfaces. Our results indicate that the electrical reconstruction in the polar oxide interfaces is a complex combination of different mechanisms, and oxygen vacancies play an important role.

Place, publisher, year, edition, pages
Warrendale, Pa.: Materials Research Society, 2012. 167-172 p.
Series
MRS Proceedings, ISSN 1946-4274 ; 1454
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:hj:diva-19856DOI: 10.1557/opl.2012.925OAI: oai:DiVA.org:hj-19856DiVA: diva2:570932
Conference
Spring Meeting 2012 of the Materials Research Society
Available from: 2012-11-20 Created: 2012-11-20 Last updated: 2015-09-02Bibliographically approved

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