Point defects at cleaved Sr sub(n+1) Ru sub(n) O sub(3n+1)(001) surfaces

The (001) surfaces of cleaved Sr sub(3) Ru sub(2) O sub(7) and Sr sub(2) RuO sub(4) samples were investigated using low-temperature scanning tunneling microscopy and density functional theory calculations. Intrinsic defects are not created during cleaving. This experimental observation is consistent...

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Bibliographic Details
Published in:	Physical review. B, Condensed matter and materials physics Vol. 90; no. 16
Main Authors:	Stoger, Bernhard, Hieckel, Marcel, Mittendorfer, Florian, Wang, Zhiming, Schmid, Michael, Parkinson, Gareth S, Fobes, David, Peng, Jin, Ortmann, John E, Limbeck, Andreas, Mao, Zhiqiang, Redinger, Josef, Diebold, Ulrike
Format:	Journal Article
Language:	English
Published:	15-10-2014
Subjects:	Condensed matter Crystal defects Electron bombardment Imaging Mathematical analysis Point defects Surface chemistry Unit cell Vacancies
Online Access:	Get full text
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Summary:	The (001) surfaces of cleaved Sr sub(3) Ru sub(2) O sub(7) and Sr sub(2) RuO sub(4) samples were investigated using low-temperature scanning tunneling microscopy and density functional theory calculations. Intrinsic defects are not created during cleaving. This experimental observation is consistent with calculations, where the formation energy for a Sr and O vacancy, 4.19 eV and 3.81 eV, respectively, is significantly larger than that required to cleave the crystal, 1.11 eV/(1 x 1) unit cell. Surface oxygen vacancies can be created through electron bombardment, however, and their appearance is shown to vary strongly with the imaging conditions. Point defects observed on as-cleaved surfaces result from bulk impurities and adsorption from the residual gas.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-2
ISSN:	1098-0121 1550-235X