LEED structure determination of the c( 8 × 2)Mn phase on Cu(100)

Gauthier, Yves; Poensgen, M.; Wuttig, Matthias

doi:10.1016/0039-6028(94)90617-3

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…This structure could be a relaxed full Mn monolayer similar to the one obtained by deposition of 1 ML Mn on Cu͑100͒ at low temperature ͑Ͻ270 K͒ which results in an 8ϫ2 structure. 17 The thickest coverage deposited in the present work ͑3.9 ML͒ leads to a diffuse LEED pattern.…”

Section: Methodsmentioning

confidence: 62%

Absolute Band Mapping by Combined Angle-Dependent Very-Low-Energy Electron Diffraction and Photoemission: Application to Cu

et al. 1998

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We have deposited Mn on the ͑110͒ surface of Ni and discover ordering into a c(2ϫ2) superstructure for coverages of 0.35-0.5 monolayer Mn. Mn 2p photoemission spectra show distinct satellite structures which disappear for higher Mn coverage. Calculations using configuration-interaction theory including multiplet effects on a model cluster representing the local geometry of a surface alloy identify the features as correlation satellites and give model parameters as follows: charge-transfer energy ⌬ϭ1 eV, Coulomb energy Uϭ3 eV, and transfer integral Tϭ1.2 eV. A detailed comparison to the case of c(2ϫ2) Mn/Cu͑100͒ leads to the conclusion that c(2ϫ2) Mn/Ni͑110͒ is a new magnetic surface alloy.

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Section: Methodsmentioning

confidence: 62%

Absolute Band Mapping by Combined Angle-Dependent Very-Low-Energy Electron Diffraction and Photoemission: Application to Cu

et al. 1998

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“…2) suggest a superposition of the 45 -substrate peak and nearby overlayer peaks. We note that a slight reduction of the angle between hexagonal unit vectors from 120 to 119:7 required to form a commensurate lattice [17] cannot be resolved. Figure 3 shows a compilation of target currents at 1:6 for (from top to bottom) Cu001-1 1, Cu001-c2 2-Mn, an incompletely developed Cu001-c8 2-Mn (transition), Cu001-c8 2-Mn, Cu001-c12 8-Mn, and Cu001-1 1-Mn-Co. As to angular positions of peaks, the curve for the c2 2 phase is a replica of the curve for clean Cu(001), indicating a square lattice of the film layer.…”

mentioning

confidence: 85%

“…The c2 2 phase also forms upon deposition above 270 K. Experimental studies [12 -16] on this c2 2 phase show a surface alloy, where every other Cu atom is replaced by Mn atoms. A quantitative LEED analysis [11,17] of the c8 2 phase points to a pure Mn topmost layer in a quasihexagonal arrangement. An analysis of the c12 8 phase could not be performed due to the large size of the unit cell [11].…”

mentioning

confidence: 99%

Ion Beam Triangulation of Ultrathin Mn and CoMn Films Grown on Cu(001)

2003

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Total target currents for grazing scattering of keV protons from a crystal target are used to investigate the structure of surfaces and ultrathin films. This current shows pronounced maxima whenever the azimuthal incidence angle coincides with close-packed rows of atoms in the surface and subsurface layers. The real-space method is applied to study monolayer and bilayer films of Mn and of CoMn epitaxially grown on a Cu(001) surface.

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“…The deposited metal may form islands on the substrate or it may alloy into the first or deeper layers. 1-7 Alloying may take place both in cases where the two metals form an alloy in the bulk [8][9][10][11][12][13][14][15][16][17] and in cases where they do not. 16,[18][19][20][21][22][23][24][25][26]28 Also, one observes new overlayer phases with a structure and periodicity substantially different from that of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams for surface alloys

et al. 1997

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We discuss surface alloy phases and their stability based on surface phase diagrams constructed from the surface energy as a function of the surface composition. We show that in the simplest cases of pseudomorphic overlayers there are four generic classes of systems, characterized by the sign of the heat of segregation from the bulk and the sign of the excess interactions between the atoms in the surface ͑the surface mixing energy͒. We also consider the more complicated cases with ordered surface phases, nonpseudomorphic overlayers, second layer segregation, and multilayers. The discussion is based on density-functional calculations using the coherent-potential approximation and on effective-medium theory. We give self-consistent density-functional results for the segregation energy and surface mixing energy for all combinations of the transition and noble metals. Finally we discuss in detail the cases Ag/Cu͑100͒, Pt/Cu͑111͒, Ag/Pt͑111͒, Co/Cu͑111͒, Fe/Cu͑111͒, and Pd/Cu͑110͒ in connection with available experimental results.

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LEED structure determination of the c( 8 × 2)Mn phase on Cu(100)

Cited by 17 publications

References 17 publications

Absolute Band Mapping by Combined Angle-Dependent Very-Low-Energy Electron Diffraction and Photoemission: Application to Cu

Absolute Band Mapping by Combined Angle-Dependent Very-Low-Energy Electron Diffraction and Photoemission: Application to Cu

Ion Beam Triangulation of Ultrathin Mn and CoMn Films Grown on Cu(001)

Phase diagrams for surface alloys

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