- On the formation and structural properties of hexagonal rare earth (Y, Gd, Dy, Er and Yb) disilicide thin films
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A systematic study was performed of the solid state reaction between a 100 nm thick layer of a rare earth metal and a Si substrate. The solid state reaction of five different rare earth metals (yttrium, gadolinium, dysprosium, erbium and ytterbium) were studied by in situ X-ray diffraction measurements on Si(1 0 0), Si(1 1 1) and poly-Si. This allowed us to make a comparison between the different systems. The formation temperature of h-RESi1.7 are the highest on Si(1 1 1) and the lowest on poly-Si for all examined RE metals. Additionally, the texture of the Gd disilicide phase on Si(1 0 0) and Si(1 1 1) was investigated by means of ex situ pole figure measurements. The epitaxial relationship of hexagonal GdSi1.7 and orthorhombic GdSi2 on the different Si substrates is determined. The epitaxial growth is the strongest on Si(1 1 1).
- Geenen,Knaepen,Demeulemeester,De Keyser,Jordan-Sweet,Lavoie,Vantomme,Detavernier
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- Vacancy-induced electronic states in ErSi1.7(0001)
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The physical origin of bulk related features observed by angle-resolved photoelectron spectroscopy for an ordered 2ML √3 × √3R30° ErSi1.7 suicide on Si(111) has been investigated by means of band structure calculations. The photoemission data are well explained with the defected Er silicide model, i.e. the prominent peaks related to bulk states are consistent with the presence of a defected Si graphite-like plane. More specifically, the calculations clearly predict a nearly flat non-bonding π band near the Fermi level that is observed experimentally and directly reflects the ordered √3 array of Si vacancies.
- Stauffer,Mharchi,Saintenoy,Pirri,Wetzel,Bolmont,Gewinner
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- The ternary RE-Si-B systems (RE = Dy, Ho, Er and Y) at 1270 K: Solid state phase equilibria and magnetic properties of the solid solution REB2-xSix (RE = Dy and Ho)
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The solid state phase equilibria in the ternary RE-Si-B diagrams (RE = Dy, Ho, Er and Y) were determined at 1270 K using experimental techniques such as X-ray diffraction, scanning electron microscopy and electron probe microanalysis. In general, three ternary phases were obtained for each diagram: the line compound RE5Si2B8 with tetragonal symmetry, the boron-inserted Nowotny phase RE5Si3Bx of Mn5Si3-type and the solid solution REB2-xSix of AlB2-type. Prior to this work, the binary systems RE-Si and RE-B, which form the boundary of each diagram, were also re-investigated. In addition to the structures of RE5Si3 (Mn5Si3-type, RE = Dy, Ho and Y) and Dy3Si4 (Ho3Si4-type) which were previously reported or will be presented in a forthcoming paper, the X-ray single crystal structures of RE5Si4 (Sm5Ge4-type, RE = Dy and Ho), DySi (CrB-type) and HoSi in both polymorphic modifications, i.e. the FeB- (high temperature) and CrB- (low temperature) types, were determined and are described herein. Structural relationships between members of the same series on one side, and between both forms of HoSi on the other side, are also discussed in terms of coordination polyhedra and interatomic distances. Finally, magnetic measurements were performed on the alloys REB2-xSix, which in case of RE = Dy exhibit a marked increase of the magneto-crystalline anisotropy, whereas for RE = Ho a change from ferromagnetic to antiferromagnetic behaviour with increasing silicon content is encountered.
- Roger, Jérome,Babizhetskyy, Volodymyr,Guizouarn, Thierry,Hiebl, Kurt,Guérin, Roland,Halet, Jean-Fran?ois
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- Investigation of the geometric and electronic structures of ErSi (2-x) with the density functional theory and comparison with STM images
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Study of ErSi(2-x) surfaces system is submitted at one controversy in reason of the STM images bias voltage dependence. In this article, we have investigated by means of calculations issued of the density functional theory (DFT), atomic surface
- Duverger,Palmino,Ehret,Labrune
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