Determination of the structure of Cu{100}-p()R45°–Sn by dynamical LEED

Pussi, Katariina; AlShamaileh, Ehab; McLoughlin, Eilish; Cafolla, A.A.; Lindroos, M.

doi:10.1016/j.susc.2003.11.029

Cited by 26 publications

(44 citation statements)

References 12 publications

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“…3c are higher than the others by $0.009 nm, and the lower Sn atoms in the middle of the unit cell are displaced by $0.031 nm, approaching each other. These parameters agree well with the model [4] Fig. 1.…”

Section: Phasesupporting

confidence: 85%

“…The positions of the protrusions in the image are consistent with those of Sn atoms in the structural model, which was proposed on the basis of a dynamical LEED analysis [4] and shown in Fig. 3c.…”

Section: Phasesupporting

confidence: 80%

“…Thenceforth, the Sn/Cu(0 0 1) surfaces have been studied by several methods, such as scanning tunneling microscopy (STM), LEED, and surface X-ray diffraction (SXRD) for each phase [3,4]. According to these studies, surface alloy structures have been revised for phases 1 and 3.…”

Section: Introductionmentioning

confidence: 99%

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STM observation of surface phases of Sn/Cu(001)

et al. 2007

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Section: Phasesupporting

confidence: 85%

Section: Phasesupporting

confidence: 80%

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STM observation of surface phases of Sn/Cu(001)

et al. 2007

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“…Among these ordered structures, the (3 √ 2 × √ 2)R45 • structure was analysed by dynamical LEED, which yielded a structural model shown in Fig. 9 with a Pendry reliability factor R P = 0.26 [75]. The model corresponds to a nominal Sn coverage of 1/2.…”

Section: Structure Of Heavier P-block Metallic Element Monolayers On mentioning

confidence: 99%

Surface Peierls transition on Cu(001) covered with heavier p-block metals

Aruga

2006

Surface Science Reports

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The Cu(001) surface covered with submonolayer coverages of In and Sn undergoes phase transitions at around 350-400 K. The transition is associated with the surface electronic structure change between low-temperature gapped and high-temperature ungapped ones. The energy gap positions in the k space coincide with the surface Brillouine zone boundaries of the low-temperature phases. These observations imply that the phase transitions are classified into the Peierls-type charge density wave (CDW) phase transition. The CDW ground states are characterized by large overall CDW gaps and long CDW correlation lengths. Structural studies show that the transitions are associated with order-disorder processes. This suggests that these are in strong-coupling regime. However, the associated gapped-ungapped change suggests that the electronic terms play significant role, in contradiction with the strong-coupling scenario. Based on the results of recent works on precise temperature dependence of the CDW gap and critical X-ray scattering, the origin of this dual nature and the detailed mechanism of the phase transition is discussed. It is suggested that the electronic entropy of the CDW ground state is not governed by the overall energy gap but by the gap between the upper band minimum and the Fermi level of the whole system. The dual nature of the surface Peierls transition on Cu(001) originates, on one hand, from the existence at metal surfaces of the two characteristic energy gaps: the overall gap, which determines the CDW stabilization energy, and the upper gap, which governs the electronic entropy. On the other hand, the CDW correlation length is suggested to play another significant role in determining the nature of the Peierls transition. The classification of the Peierls transisions according to the CDW correlation length and the gap size is discussed. It is suggested that the surface Peierls transition on metal-covered Cu(001) covered with heavier p-block metallic elements are qualitatively different from both the weak-coupling CDW transition, with long CDW correlation length and small gaps, and the strong-coupling CDW transitions, with short correlation lengths and large gaps, and should be classified into the third class, which is characterized by long coherence and strong coupling.

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“…Among such adsorption systems, Sn-adsorbed Cu(0 0 1) surfaces have been extensively studied [4][5][6][7][8][9][10][11][12][13][14]. The Cu(0 0 1)-Sn system showed five ordered phases at room temperature in a submonolayer coverage [9,12].…”

Section: Introductionmentioning

confidence: 99%