A re-interpretation of the Cu/Sn surface phase diagram

McLoughlin, Eilish; Cafolla, A.A.; AlShamaileh, Ehab; Barnes, Colin

doi:10.1016/s0039-6028(01)00912-8

Cited by 27 publications

(24 citation statements)

References 18 publications

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“…It is possible to prepare the surface fully covered by the structure shown in this figure. Its LEED pattern is the same as that for phase 2 in the previous report [2]. Comparing the positions of the protrusions in the area A with those in the coexisting area of phase 1, we can illustrate a model of this p(2 · 6) structure as shown schematically in Fig.…”

Section: Resultssupporting

confidence: 52%

“…The observed structure for phase 2 is different from the models previously proposed based on the LEED I-V analysis [1,2]. We will discuss possible alloy structures for phase 2, phase 3, and the new phase, and a locally-ordered nanostructure consisting of the new phase and a distorted phase 3 structure.…”

Section: Introductionmentioning

confidence: 70%

“…They concluded the existence of four ordered structures, which depend on the amount of Sn adsorbates. The surface structures were re-interpreted by McLoughlin et al using a quantitative analysis of energy-dependent LEED intensity (LEED I-V) [2]. They proposed structural models for the three phases, which are called phases 1, 2, and 3, and had 0.20 ML, 0.33 ML, and 0.50 ML of Sn, respectively.…”

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: Resultssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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

et al. 2007

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“…The model corresponds to a nominal Sn coverage of 1/2. With this value as a reference, the coverages for the complex, (6×2), and (2 √ 2×2 √ 2)R45 • phases were estimated to be 0.21-0.25, 0.37-0.42, and 0.63-0.7 [73,74]. A study by RBS/channelling indicated the alloying at submonolayer coverages [76].…”

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

confidence: 99%

“…For the first structure, which exhibits a complex LEED pattern, a structure model was proposed which consists of (2 × 2) patches separated by anti-phase domain boundaries [74]. This is similar to the Cu(001)-…”

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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