Point defects at cleaved Srn+1Run O3n+1 (001) surfaces

Bernhard Stöger, Marcel Hieckel, Florian Mittendorfer, Zhiming Wang, Michael Schmid, Gareth S. Parkinson, David Fobes, Jin Peng, John E. Ortmann, Andreas Limbeck, Zhiqiang Mao, Josef Redinger, Ulrike Diebold

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8 Scopus citations

Abstract

The (001) surfaces of cleaved Sr3Ru2O7 and Sr2RuO4 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 × 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.

Original languageEnglish (US)
Article number165438
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number16
DOIs
StatePublished - Oct 30 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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