High Chemical Activity of a Perovskite Surface: Reaction of CO with Sr3Ru2O7

Bernhard Stöger, Marcel Hieckel, Florian Mittendorfer, Zhiming Wang, David Fobes, Jin Peng, Zhiqiang Mao, Michael Schmid, Josef Redinger, and Ulrike Diebold
Phys. Rev. Lett. 113, 116101 – Published 10 September 2014
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Abstract

Adsorption of CO at the Sr3Ru2O7(001) surface was studied with low-temperature scanning tunneling microscopy (STM) and density functional theory. In situ cleaved single crystals terminate in an almost perfect SrO surface. At 78 K, CO first populates impurities and then adsorbs above the apical surface O with a binding energy Eads=0.7eV. Above 100 K, this physisorbed CO replaces the surface O, forming a bent CO2 with the C end bound to the Ru underneath. The resulting metal carboxylate (Ru-COO) can be desorbed by STM manipulation. A low activation (0.2 eV) and high binding (2.2eV) energy confirm a strong reaction between CO and regular surface sites of Sr3Ru2O7; likely, this reaction causes the “UHV aging effect” reported for this and other perovskite oxides.

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  • Received 17 June 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.116101

© 2014 American Physical Society

Authors & Affiliations

Bernhard Stöger1, Marcel Hieckel1,2, Florian Mittendorfer1,2, Zhiming Wang1, David Fobes3, Jin Peng3, Zhiqiang Mao3, Michael Schmid1, Josef Redinger1,2, and Ulrike Diebold1

  • 1Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria
  • 2Center for Computational Materials Science, Vienna University of Technology, Gußhausstraße 25-25a, A-1040 Vienna, Austria
  • 3Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA

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Issue

Vol. 113, Iss. 11 — 12 September 2014

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