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| 001 | 826068 | ||
| 005 | 20230426083141.0 | ||
| 024 | 7 | _ | |2 doi |a 10.1103/PhysRevB.93.235429 |
| 024 | 7 | _ | |2 ISSN |a 0163-1829 |
| 024 | 7 | _ | |2 ISSN |a 0556-2805 |
| 024 | 7 | _ | |2 ISSN |a 1094-1622 |
| 024 | 7 | _ | |2 ISSN |a 1095-3795 |
| 024 | 7 | _ | |2 ISSN |a 1098-0121 |
| 024 | 7 | _ | |2 ISSN |a 1550-235X |
| 024 | 7 | _ | |2 ISSN |a 2469-9950 |
| 024 | 7 | _ | |2 ISSN |a 2469-9969 |
| 024 | 7 | _ | |2 Handle |a 2128/13425 |
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| 100 | 1 | _ | |0 P:(DE-HGF)0 |a Bauer, O. |b 0 |
| 245 | _ | _ | |a Au enrichment and vertical relaxation of the Cu$_{3}$ Au ( 111 ) surface studied by normal-incidence x-ray standing waves |
| 260 | _ | _ | |a Woodbury, NY |b Inst. |c 2016 |
| 336 | 7 | _ | |2 DRIVER |a article |
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| 520 | _ | _ | |a We have investigated the Cu3Au(111) surface, prepared under ultrahigh vacuum conditions by sputtering and annealing, by low energy electron diffraction (LEED), scanning tunneling microscopy (STM), x-ray photoelectron spectroscopy, and normal incidence x-ray standing waves (NIXSW). We find the surface to be depleted with Cu and enriched with Au at the same time, yielding a nominal Cu:Au ratio of 0.61:0.39 in the topmost layer. The STM images reveal that the first layer is nearly closely filled with atoms and contains a small amount of vacancies with an area concentration of about 5%. Together with the Au enrichment, these cause local short-range disorder of the Au p(2×2) reconstruction. From this data, the average stoichiometry of the p(2×2) surface unit cell is estimated at Cu2.22Au1.44□0.20 (instead of Cu3.00Au1.00□0.00 of the ideal surface; □ denotes an atomic vacancy site). From NIXSW we find a significant outward relaxation of both the Cu and Au atoms of the topmost layer by 0.28 Å and 0.33 Å, which corresponds to 13% and 15% of the (111) bulk layer spacing of Cu3Au. We suggest that this originates from a widening of the first/second layer spacing, by 6.8% and 8.8% for the Cu and Au atoms, respectively, plus an additional rigid increase in the second/third layer spacing by 6.2%. We explain this by steric repulsions between Au atoms of the topmost layer, replacing smaller Cu atoms, and Au atoms in the second layer in combination with disorder. Finally, a lateral reconstruction, similar to that on the Au(111) surface, but with a much larger periodicity of 290 Å, is identified from LEED. |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Schmitz, C. H. |b 1 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Ikonomov, J. |b 2 |
| 700 | 1 | _ | |0 P:(DE-Juel1)142384 |a Willenbockel, M. |b 3 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Soubatch, S. |b 4 |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Sokolowski, M. |b 6 |e Corresponding author |
| 773 | 1 | 8 | |a 10.1103/physrevb.93.235429 |b American Physical Society (APS) |d 2016-06-16 |n 23 |p 235429 |3 journal-article |2 Crossref |t Physical Review B |v 93 |y 2016 |x 2469-9950 |
| 773 | _ | _ | |a 10.1103/PhysRevB.93.235429 |g Vol. 93, no. 23, p. 235429 |0 PERI:(DE-600)2844160-6 |n 23 |p 235429 |t Physical review / B |v 93 |y 2016 |x 2469-9950 |
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