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Spatial distribution of oxygen vacancies in Cr-doped SrTiO3 during an electric-field-driven insulator-to-metal transition
Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.ORCID-id: 0000-0002-3764-4235
Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.
IBM Research, Zurich Research Laboratory, Rüschlikon, Switzerland.
2009 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, nr 1, s. Article number: 013513-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Spatially resolved x-ray fluorescence maps are presented that show the introduction and the evolution of oxygen vacancies in chromium-doped strontium titanate during an electric-field-driven insulator-to-metal transition. The vacancies are introduced at the anode and diffuse through the crystal toward the cathode. The spatial distribution of vacancies is explained by a model describing the electrical breakdown as a percolation process. Strong differences in the vacancy distribution were found when the transition took place in air and in a hydrogen-enriched atmosphere. In air, the vacancies disappeared from the surface, whereas in the reducing hydrogen atmosphere, they remained at the surface. © 2009 American Institute of Physics.

Ort, förlag, år, upplaga, sidor
College Park, MD: American Institute of Physics (AIP), 2009. Vol. 94, nr 1, s. Article number: 013513-
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URN: urn:nbn:se:hh:diva-26526DOI: 10.1063/1.3069140ISI: 000262357800100Scopus ID: 2-s2.0-58149523053OAI: oai:DiVA.org:hh-26526DiVA, id: diva2:747658
Tillgänglig från: 2014-09-17 Skapad: 2014-09-17 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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