First-principles study of the Ni(111)()R30°–Pb surface

Li, D.F.; Xiao, Haiyan; Zu, Xu; Dong, Hui

doi:10.1016/j.physb.2006.11.020

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…Incidentally, the bias-dependent apparent height difference has also been examined, displaying a rather small variation within ±0.1 Å in a bias range of ±1.0 V (see Figure S1 in the Supporting Information for details). These results imply an intermixing of Ni and Pb in the ordered superstructure based on the apparent height being lower than those expected from simple hard-sphere arguments. , Note that the high-temperature growth of a Ni 2 Pb surface alloy has been reported by depositing Pb onto Ni(111). , …”

Section: Results and Discussionmentioning

confidence: 75%

“…These results imply an intermixing of Ni and Pb in the ordered superstructure based on the apparent height being lower than those expected from simple hard-sphere arguments. 39,40 Note that the hightemperature growth of a × °R 3 3 30 Ni 2 Pb surface alloy has been reported by depositing Pb onto Ni(111). 41,42 As shown in Figure 1d,e, the ordered superstructure is composed of two types of nanodot arrays: one is the rectangular lattice × °R (3 3 3) 30 , i.e., with respect to (1 × 1) lattice of Pb(111), and the other is the hexagonal lattice × °R (3 3 3 3) 30 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Proximity-Effect-Induced Anisotropic Superconductivity in a Monolayer Ni-Pb Binary Alloy

Lin

Hsu

Jang

et al. 2022

ACS Appl. Mater. Interfaces

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A proximity effect facilitates the penetration of Cooper pairs that permits superconductivity in a normal metal, offering a promising approach to turn heterogeneous materials into superconductors and develop exceptional quantum phenomena. Here, we have systematically investigated proximity-induced anisotropic superconductivity in a monolayer Ni-Pb binary alloy by combining scanning tunneling microscopy/spectroscopy (STM/STS) with theoretical calculations. By means of high-temperature growth, the Ni-Pb surface alloy has been fabricated on Pb(111) and the appearance of a domain boundary as well as a structural phase transition can be deduced from a half-unit-cell lattice displacement. Given the high spatial and energy resolution, tunneling conductance (dI/dU) spectra have resolved the reduced but anisotropic superconducting gap ΔNiPb ≈ 1.0 meV, in stark contrast to the isotropic ΔPb ≈ 1.3 meV. In addition, the higher density of states at the Fermi energy (D(E F)) of the Ni-Pb surface alloy results in an enhancement of coherence peak height. According to the same T c ≈ 7.1 K with Pb(111) from the temperature-dependent ΔNiPb and the short decay length L d ≈ 3.55 nm from the spatially monotonic decrease of ΔNiPb, both results are supportive of a proximity-induced superconductivity. Despite a lack of a bulk counterpart, the atomically thick Ni-Pb bimetallic compound opens a pathway to engineer superconducting properties down to the two-dimensional limit, giving rise to the emergence of anisotropic superconductivity via a proximity effect.

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Section: Results and Discussionmentioning

confidence: 75%

Section: ■ Results and Discussionmentioning

confidence: 99%

Proximity-Effect-Induced Anisotropic Superconductivity in a Monolayer Ni-Pb Binary Alloy

Lin

Hsu

Jang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…These results imply an intermixing of Ni and Pb in the ordered superstructure on a basis of the lower apparent height than those expected from simple hard-sphere arguments. 34,35 Note that the high temperature growth of √ 3 × √ 3R30 0 Ni 2 Pb 1 surface alloy has been reported by depositing Pb onto Ni(111) in previous studies. 36,37 According to the atomic resolution of Pb(111) and the embedded Ar-filled nano-cavities, we are allowed to determine the lattice constant and the directions of high symmetry crystalline axes, respectively.…”

Section: Introductionmentioning

confidence: 72%

Proximity-Effect-Induced Anisotropic Superconductivity in Monolayer Ni-Pb Binary Alloy

Lin¹,

Hsu²,

Jang³

et al. 2021

Preprint

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Proximity effect facilitates the penetration of Cooper pairs that permits superconductivity in normal metal, offering a promising approach to turn heterogeneous materials into superconducting and develop exceptional quantum phenomena. Here, we have systematically investigated proximity-induced anisotropic superconductivity in monolayer Ni-Pb binary alloy by combining scanning tunneling microscopy/ spectroscopy (STM/STS) with theoretical calculations. By means of high temperature growth, the (3 √ 3 × 3 √ 3)R30 o Ni-Pb surface alloy has been fabricated on the Pb(111), where the appearance of domain boundary as well as lattice transformation are further corroborated by the STM simulations. Given the high spatial and energy resolution, tunnelling

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“…12,13 Moreover, it has been suggested that the adsorption of atoms on the surface of the metal gates can change the work function. [14][15][16] The spintronics can be said to have begun with the discovery of the giant magnetoresistance (GMR) effect and the interlayer exchange coupling in metallic multilayers by Grünberg and Fert. 17,18 The important idea of GMR effect is the spin-dependent scattering.…”

Section: Introductionmentioning

confidence: 99%

A novel spin modulation of work function for C adsorbed Cr/Fe(001) metal gate

Zhong¹,

Xu²,

Cheng³

et al. 2012

AIP Advances

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Work functions and magnetic moments of C adsorbed Cr/Fe(001) surfaces with different C coverages θ and magnetic alignments (parallel or antiparallel) between Cr and Fe atom moments are investigated using first-principles methods based on density functional theory. The calculated results reveal that the spin configuration plays a significant role in determining the work function of the systems. The work functions of the systems with parallel states are evidently larger than those with antiparallel states. Moreover, for θ≤0.5 ML, with increasing value of θ, the work function increases from 4.23 eV to 5.13 eV for antiparallel states and from 4.47 eV to 5.44 eV for parallel states. While for θ>0.5 ML, the work function decreases with increasing value of θ. It can be also found that, for θ≤0.5 ML, the smaller the Cr and Fe magnetic moments are, the lower the Fermi energy EF is and the larger the work functions of the systems are. Based on analysis and discussion, we conclude that the changes of the work functions and magnetic moments are mainly determined by those of Fermi level and density of state (DOS) induced by the spin polarization, the electron transfer and the surface structure. Our work strongly suggests that controlling the magnetic states is a promising way for modulating the work function of magnetic metal gate

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First-principles study of the Ni(111)()R30°–Pb surface

Cited by 15 publications

References 30 publications

Proximity-Effect-Induced Anisotropic Superconductivity in a Monolayer Ni-Pb Binary Alloy

Proximity-Effect-Induced Anisotropic Superconductivity in a Monolayer Ni-Pb Binary Alloy

Proximity-Effect-Induced Anisotropic Superconductivity in Monolayer Ni-Pb Binary Alloy

A novel spin modulation of work function for C adsorbed Cr/Fe(001) metal gate

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