Interface structure and misfit dislocations in thin Cu films on Ru(0001)

Pötschke, G.; Behm, R. Jürgen

doi:10.1103/physrevb.44.1442

Cited by 111 publications

(60 citation statements)

References 12 publications

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“…At higher coverage (∼10 ML thickness) Pt relaxes to its bulk lattice constant (3.92 A) in agreement with that observed in UHV, for that the dislocation lines were observed in the STM images for 8 ML Pt on Ru(0001), while the dislocation lines were absent at 4 ML coverage [22]. The lattice strain relief by increased layer thickness has also been observed for Co on Pt(111) [28], Cu on Ru(0001) [30], and Pd on Au(100) [6]; for instance at low coverage the lateral spacing of the Pd layers is compressed with respect to bulk Pd to match with the Au(100) substrate, but at higher coverage the Pd lattice relaxes to that of the bulk Pd. We are questioning whether the additional 3D-spots in the RHEED (Figures 1(f) and 1(i)) are due to the Pt-clusters with a hcp phase grown on Ru(0001).…”

Section: Discussionsupporting

confidence: 74%

“…Furthermore, the lattice strain of an admetal layer with the underlying substrate may result from their lattice mismatch, like that found for Pt on Ru(10-10) [16], Co on Pt(111) [28], Ag on Pt(111) [29], and Cu on Ru(0001) [30]; it is expected to gradually vanish for two, three, or more layers, leading to lattice dislocations as observed for Pt overlayer on Ru(0001) [4,23] and Ru on Pt(111) observed in the present work. It is a pity that the formation of the twinned Pt nanoclusters on Ru(0001) has not been mentioned and discussed by the reported works [5,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Epitaxial Growth of Ru and Pt on Pt(111) and Ru(0001), Respectively: A Combined AES and RHEED Study

Zei

2010

Journal of Nanotechnology

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The epitaxial growth of Pt and Ru deposits by spontaneous, as well as by dynamic, electrodeposition onto Ru(0001) and Pt(111), respectively, have been studied by reflection high energy electron diffraction (RHEED) and Auger electron spectroscopy (AES). For the Pt deposit on Ru(0001), at submonolayer range, it preferably grows compressed commensurate bilayer thick islands on Ru(0001). This is the first time that RHEED observation of the onset of Pt twinning occurs in ca. 2-3 layer thick islands on Ru at room temperature, at which the surface strain due to the 2.5% lattice mismatch of Pt and Ru remains intact. For multilayer thick islands (>6 ML) ordered reflection twins (diameter of ∼3 nm) develop and are embedded in a (111) matrix with an incoherent (11-2) twin plane normal to Ru(0001) and aligned with their [−110] direction parallel to the [11][12][13][14][15][16][17][18][19][20] Ru(0001) substrate direction. For the Ru deposit on Pt(111), at ∼0.2 ML a strained (1 × 1) monoatomic layer is formed due to the 2.5% lattice mismatch of Ru and Pt. Increasing the coverage up to ∼0.64, the second Ru layer is found to relieve the strain in the first layer, giving rise to dislocations and Ru relaxes to its bulk lattice constant. Multilayers of Ru (>1 ML) result in (0001) nanocluster formation aligned with its [11][12][13][14][15][16][17][18][19][20] direction parallel to the [−110] Pt(111) substrate direction.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Epitaxial Growth of Ru and Pt on Pt(111) and Ru(0001), Respectively: A Combined AES and RHEED Study

Zei

2010

Journal of Nanotechnology

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“…The scanning tunneling microscope ͑STM͒ is the instrument of choice when it comes to atomic resolution imaging of the structure and dynamics of surfaces and features on surfaces. There were several STM investigations about dislocations about a decade ago [9][10][11][12][13][14][15][16] but at that time interpretation of the results was difficult, largely because theorists could not yet perform the necessary large-scale calculations to understand the measurements.…”

Section: Introductionmentioning

confidence: 99%

Atomic structure of screw dislocations intersecting theAu(111)surface: A combined scanning tunneling microscopy and molecular dynamics study

et al. 2006

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“…In analogy to the Au(1 1 1) reconstruction and the Cu bilayer on Ru(0 0 0 1) [256,257], strain relief in this structure can only be unidirectional on a local scale. For AgaPt(1 1 1) this structure turns out to be metastable.…”

Section: Nucleation On Dislocation Networkmentioning

confidence: 99%