Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.116101
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Funding
- Austrian Science Fund (FWF) [F45]
- ERC Advanced Grant OxideSurfaces
- NSF [DMR-1205469]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205469] Funding Source: National Science Foundation
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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 E-ads = -0.7 eV. 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 (-2.2 eV) 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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