2005
DOI: 10.1103/physrevb.71.165306
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Surface atomic structure determination of three-dimensional yttrium silicide epitaxially grown on Si(111)

Abstract: The surface atomic structure of thin layers of three-dimensional yttrium silicide epitaxially grown on Si͑111͒ 7 ϫ 7 has been investigated by means of dynamical low-energy electron diffraction analysis. We determine the interlayer distances as well as the lateral and/or vertical relaxations of the atoms in the superficial planes. The epitaxial silicide consists of stacked hexagonal rare-earth planes and graphitelike Si planes with an ordered arrangement of Si vacancies. The ordered net of Si vacancies in the i… Show more

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Cited by 15 publications
(8 citation statements)
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“…[24]. Our result is in good agreement with the LEED result of Rogero et al [25] of the YSi 1.7 /Si(1 1 1) system. We find a difference in the vertical positions of 0.14 Å between the Si down atom on top of a vacancy with respect to the other down atoms (a similar result was found in Ref.…”
Section: A Few Layers Of Yttrium Silicide Deposited On Sisupporting
confidence: 95%
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“…[24]. Our result is in good agreement with the LEED result of Rogero et al [25] of the YSi 1.7 /Si(1 1 1) system. We find a difference in the vertical positions of 0.14 Å between the Si down atom on top of a vacancy with respect to the other down atoms (a similar result was found in Ref.…”
Section: A Few Layers Of Yttrium Silicide Deposited On Sisupporting
confidence: 95%
“…Our total energy calculations favored the model of Martin-Gago et al [16,17] as the most stable atomic geometry. We shall mention that this model has been corroborated by LEED experiments on YSi 1.7 / Si(1 1 1)-( ffiffi ffi 3 p  ffiffi ffi 3 p ) [25]. First principles total energy also found a similar structure for the clean YSi 2 surface [24].…”
Section: A Monolayer Of Ysi 2 On Sisupporting
confidence: 66%
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“…10,11 As a result of the periodic arrangement of the vacancies, a ͑ ͱ 3 ϫ ͱ 3͒R30 ‫ؠ‬ pattern appears in low-and high-energy electron diffraction ͑LEED and HEED͒. 7,12,13 However, and in spite of their technological relevance, the surface structure of the RE silicides is still an open issue. Although it is well accepted that these surfaces are terminated in a bulklike Si bilayer without vacancies, 14 two different structural models have been proposed based on two independent STM studies on the ErSi 1.7 surface epitaxially grown on Si͑111͒.…”
mentioning
confidence: 99%
“…11 In a LEED study Rogero et al attained a good agreement with experiment for the p3m case. 12 On the other hand, Duverger et al 17 were able to reproduce theoretically the p6-type images, although hardly any reference was made to the p3m phase.…”
mentioning
confidence: 99%