Structure investigation of the (100) surface of the orthorhombic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Al</mml:mtext></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>crystal

Addou, Rafik; Gaudry, Émilie; Deniozou, Th.; Heggen, Marc; Feuerbacher, M.; Gille, Peter; Grin, Yuri; Widmer, Roland; Gröning, Oliver; Fournée, V.; Dubois, Jean‐Marie; Ledieu, J.

doi:10.1103/physrevb.80.014203

Cited by 44 publications

(63 citation statements)

References 45 publications

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“…Earlier studies of the (100) surface based on both experimental (STM, XPS, and dynamical LEED) and ab initio studies using density functional theory (DFT) have shown that the surface terminates at incomplete P layers. 16,17 The best agreement is found for the P termination models that have all 22 Al atoms per surface unit cell present, but with all 4 Co atoms per unit cell missing. Aside from these missing atoms, the surface structure is similar to that of the corresponding bulk planes, with only a small amount of relaxation in the surface layers as determined by LEED.…”

Section: A Main Features Of the Clean Surfacesupporting

confidence: 52%

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

et al. 2012

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The growth and stability of Bi thin films on the Al 13 Co 4 (100) surface has been investigated from the submonolayer to high-coverage regime by scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) for temperatures ranging from 57 to 633 K. Initially, Bi adsorption leads to the formation of a pseudomorphic monolayer, followed by the growth of islands of different heights with increasing coverage. The in-plane structure, island height, and island morphology indicate that these islands adopt either a pseudocubic (110) or hexagonal (111) orientation normal to the surface. The (110)-oriented islands correspond to bilayer stacking (either two or four monolayers in height) while the (111)-oriented islands correspond to either three-or four-layer stacking. The in-plane orientation of (110) islands with respect to the substrate is random, while (111) islands adopt one of four possible orientations. In addition, the (111) islands show a moiré structure. The fact that Bi islands grow with either (110) or (111) orientation simultaneously on the same substrate relates to a subtle energy balance between both orientations according to ab initio calculations, allowing both structures to coexist. The island density dependence versus both deposition temperature and flux, their most frequent structure type, reshaping effects, and chemical reactivity of the different allotropes are also discussed in this paper.

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Section: A Main Features Of the Clean Surfacesupporting

confidence: 52%

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

et al. 2012

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“…It has some atoms missing, but the remaining atoms essentially retain the bulk arrangement [17; 18].) In Al 13 Co 4 (100) the two types of terraces alternate laterally on the surface, separated by steps of a single height [17]. Both the alternation and the step height are consistent with the stacking of Alrich layers in the bulk structure.…”

Section: Discussionsupporting

confidence: 48%

“…In Al 13 Co 4 (100), one type of terrace disappears upon extended annealing at elevated temperature, so the other must be the less-stable termination [17]. In our experiments, we did not observe that one terrace disappears systematically with increasing temperature, but an indication of this type of evolution may be the bumps on the B-terraces.…”

Section: Discussionmentioning

confidence: 40%

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Surface Characterization of Clean Gd₅Ge₄(010)

2012

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Based on X-ray photoelectron spectroscopy, Gd5Ge 4(010) does not show evidence of surface segregation. Scanning tunneling microscopy reveals two types of terraces which alternate laterally on the surface. From the step heights, these two surface terminations are assigned as dense, Gd-pure layers in the bulk structure. There is evidence of reconstruction on one type of terrace. KeywordsPhotoelectrons, scanning tunneling microscopy, surface segregation, quasicrystal, alloy, Material Science and Engineering Disciplines Chemistry | Materials Science and Engineering Comments AbstractBased on X-ray photoelectron spectroscopy, Gd 5 Ge 4 (010) does not show evidence of surface segregation. Scanning tunneling microscopy reveals two types of terraces which alternate laterally on the surface. From the step heights, these two surface terminations are assigned as dense, Gd-pure layers in the bulk structure. There is evidence of reconstruction on one type of terrace.

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“…Perhaps most striking is a series of studies of Al13Co4(100) [44,48,49], in which three different samples yielded three different surface structures, even though the surfaces were prepared in very similar fashion. Furthermore, the stability range of bulk Al13Co4 spans only 0.5 at%, so any differences in bulk composition must have been very small.…”

Section: Discussionmentioning

confidence: 99%

Structure of the clean Gd₅Ge₄(010) surface

Yuen¹,

Miller²,

Lei³

et al. 2013

J. Phys.: Condens. Matter

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We have characterized the (010) surface of Gd5Ge4 using scanning tunneling microscopy (STM) and x-ray photoelectron spectroscopy. Data from different samples have the following features in common: (1) the surface composition equals the bulk composition to within 5 at.%, both after ion etching and after annealing at temperatures of 400-1200 K; and (2) the surface exhibits terraces of two types. The height of the steps between similar terraces corresponds well to the separation between equivalent layers along the h010i direction in the bulk structure. Density functional theory (DFT) shows that the surface energy of the (0001) plane of hexagonal close-packed Gd is lower than that of the (111) plane of diamond-type Ge, suggesting that surfaces of Gd5Ge4 (for comparable density) should be rich in Gd. Indeed, DFT shows that among the bulk terminations of Gd5Ge4, a pure Ge termination is not favored. Each of the three remaining terminations (two pure Gd and one mixed, Gd-Ge) has its minimum surface energy in a different range of the possible Gd chemical potentials, indicating that different terminations may be stable under different conditions. DFT shows that the heights of the steps between dissimilar terraces, measured in STM, are consistent with the two pure Gd terminations. Abstract.We have characterized the (010) surface of Gd5Ge4 using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy. Data from different samples have the following features in common: (1) Surface composition equals bulk composition to within 5 atomic %, both after ion etching and after annealing at temperatures of 400 K to 1200 K; and (2) The surface exhibits two types of terraces.Step heights between similar terraces correspond well to the separation between equivalent layers along the <010> direction in the bulk structure. Density functional theory (DFT) shows that the surface energy of the (0001) plane of hcp Gd is lower than that of the (111) plane of diamond-type Ge, suggesting that surfaces of Gd5Ge4 (for comparable density) should be Gd-rich. Indeed, among the bulk terminations of Gd5Ge4, DFT shows that a pure Ge termination is not favored. The three remaining terminations (two pure Gd and one mixed DFT shows that step heights between dissimilar terraces, measured in STM, are consistent with the two pure Gd terminations.

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Structure investigation of the (100) surface of the orthorhombicAl13Co4crystal

Cited by 44 publications

References 45 publications

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

Surface Characterization of Clean Gd₅Ge₄(010)

Structure of the clean Gd₅Ge₄(010) surface

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Structure investigation of the (100) surface of the orthorhombicAl13Co4crystal

Cited by 44 publications

References 45 publications

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

Competing allotropes of Bi deposited on the Al13Co4(100) alloy surface

Surface Characterization of Clean Gd5Ge4(010)

Structure of the clean Gd5Ge4(010) surface

Contact Info

Product

Resources

About

Surface Characterization of Clean Gd₅Ge₄(010)

Structure of the clean Gd₅Ge₄(010) surface