Quantized conductance in AuAg nanocontacts under high biases

Enomoto, Akihiro; Mizobata, Jun-ichi; Kurokawa, Shu; Sakai, Akira

doi:10.1016/s0039-6028(02)01626-6

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…In our previous high-bias experiment on AuAg alloys [28], we found that the 1G 0 conductance peak of the Au-31at%Ag alloy yields a higher 1G 0 conductance peak than that of pure Au, and its 1G 0 contacts are considered more stable. However, the break-voltage distribution of the Au-31at%Ag alloy shown in Fig.…”

Section: Auag Alloysmentioning

confidence: 75%

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Miura

Iwata

Kurokawa

et al. 2009

e-J. Surf. Sci. Nanotechnol.

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We have measured the break voltage of the 1G0 contact of Au, Ag, Cu, and AuAg alloys at room temperature in ultrahigh vacuum. Exploiting the break junction technique, we produced a 1G0 contact and broke it by applying a voltage ramp. The break voltage of each metal exhibits a broad distribution, and the average break voltage decreases as Au > Cu & Ag, in consistent with the elemental dependence of the high-bias stability of the 1G0 contact suggested in previous experimental studies. In AuAg alloys, the break-voltage distribution for some alloys exhibits a double-peak structure, each peak locating close to the break voltage of the 1G0 contact of pure Au and Ag, respectively. This observation suggests that the break voltage of AuAg alloys is locally determined by the elemental species of the atom occupying the contact site.

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Section: Auag Alloysmentioning

confidence: 75%

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Miura

Iwata

Kurokawa

et al. 2009

e-J. Surf. Sci. Nanotechnol.

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“…For Au and Ag one can form random alloys in the entire concentration range and one finds a gradual cross-over from the Au to the Ag histograms [243]. In studies for alloys of Cu, Ag and Au with transition metals it is found that the peak at 1 G 0 , that is characteristic for the noble metals, survives for transition metal concentrations well over 50% [243,244,245]. The interpretation for this observation requires further study.…”

Section: Metallic Alloys and Compoundsmentioning

confidence: 94%

“…The first experiment shows that the addition of a few percent Co does not signifi-cantly modify the histogram compared to pure Au. For Au and Ag one can form random alloys in the entire concentration range and one finds a gradual cross-over from the Au to the Ag histograms [243]. In studies for alloys of Cu, Ag and Au with transition metals it is found that the peak at 1 G 0 , that is characteristic for the noble metals, survives for transition metal concentrations well over 50% [243,244,245].…”

Section: Metallic Alloys and Compoundsmentioning

confidence: 99%

Quantum properties of atomic-sized conductors

2003

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Using remarkably simple experimental techniques it is possible to gently break a metallic contact and thus form conducting nanowires. During the last stages of the pulling a neck-shaped wire connects the two electrodes, the diameter of which is reduced to single atom upon further stretching. For some metals it is even possible to form a chain of individual atoms in this fashion. Although the atomic structure of contacts can be quite complicated, as soon as the weakest point is reduced to just a single atom the complexity is removed. The properties of the contact are then dominantly determined by the nature of this atom. This has allowed for quantitative comparison of theory and experiment for many properties, and atomic contacts have proven to form a rich test-bed for concepts from mesoscopic physics. Properties investigated include multiple Andreev reflection, shot noise, conductance quantization, conductance fluctuations, and dynamical Coulomb blockade. In addition, pronounced quantum effects show up in the mechanical properties of the contacts, as seen in the force and cohesion energy of the nanowires. We review this reseach, which has been performed mainly during the past decade, and we discuss the results in the context of related developments.Comment: Review, 120 pages, 98 figures. In view of the file size figures have been compressed. A higher-resolution version can be found at: http://lions1.leidenuniv.nl/wwwhome/ruitenbe/review/QPASC-hr-ps-v2.zip (5.6MB zip PostScript

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“…The conduction features of SAWWs, e.g., ballistic conduction and its opposite Peiels transition, have been found in studies based on scanning tunneling microscopy, mechanical controllable break junction techniques, and in situ transmission electron microscopy (TEM) employing mechanical breaking operation systems of nanometer-sized contacts. ,,,, Theoretical and calculation studies reveal that such conduction features are closely related to inherent SAWW structures. − In the mechanical breaking methods, in situ TEM enables the direct observation of the atomic configuration of SAWWs in addition to conductance. ,,,,− Thus, this method has been applied to SAWWs comprised of various single elements and the relationships between the length, atomic configuration, i.e., the shapes and interatomic distances, and the conductance have been investigated. For SAWWs comprised of several elements, i.e., alloy SAWWs, their stable structures and properties also depend on the allocation of elements. − However, when TEM is applied to alloy SAWWs, the identification of elements has been limited to elements having sufficiently different atomic numbers . To expand the studies and application of alloy SAWWs, new approaches have been needed.…”

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confidence: 99%

Element Mapping in Single-Atom-Width Platinum–Iridium Wires

et al. 2020

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Single-atom-width wires (SAWWs) of platinum–iridium (PtIr) alloy were produced by mechanical breaking inside a transmission electron microscope. The formation dynamics, the atomic configuration, and the conductance were observed in situ. From the observed lattice images of the SAWWs and image simulation, the structure models, i.e., the configurations of atom position and element allocation, were constructed. Using the experiment-based structural models, the first-principle calculation of the conductance was performed. The atomic configuration and element allocation of the observed SAWWs were identified via the combination of the lattice imaging and calculation. The conductance of PtIr SAWWs changed in complexity for different element allocation in addition to the wire length and the configuration of the constituent atoms, which was difficult to presage from the conductance features of pure metal SAWWs. The present study revealed that the conductance of alloy SAWWs can be controlled by element allocation.

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Quantized conductance in AuAg nanocontacts under high biases

Cited by 8 publications

References 17 publications

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Break Voltage of the 1G0 Contact of Noble Metals and Alloys

Quantum properties of atomic-sized conductors

Element Mapping in Single-Atom-Width Platinum–Iridium Wires

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