Point-contact spectroscopy in metals

Jansen, A. G. M.; Gelder, A. P. van; Wyder, P.

doi:10.1088/0022-3719/13/33/009

Cited by 404 publications

(180 citation statements)

References 37 publications

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“…Their findings are discussed at length 1 For example, Fig. 3C of [28] shows a d 2 I/dV 2 spectrum with sharp signals, more or less symmetric about zero, that are consistent with being derivatives of spikes in the dI/dV conductance curve. Note that these signals are too sharp to be spectroscopic signals smeared by kT , but are indicative of abrupt transitions.…”

Section: Experimental Facts For Quenched Cu Samplesmentioning

confidence: 79%

“…[33]. Even the dramatic conductance transitions have probably been seen in early ZBA experiments [28], though their presence had not been emphasized there. 1 The advent of the mechanically very stable nanoconstrictions employed by RB allowed a detailed systematic study of the ZBA.…”

Section: Experimental Facts For Quenched Cu Samplesmentioning

confidence: 98%

“…Some aspects of the theory of transport through ballistic constrictions [28,29] are reviewed in Appendix A of paper II. Here we merely summarize the main conclusions.…”

Section: Ballistic Point Contact Spectroscopymentioning

confidence: 99%

“…The quenched Cu constrictions actually are considerably cleaner than is assumed in WAM's scenario, as can be seen from three separate arguments: (a) According to (Cu.5), a direct estimate of the mean free path, based on the point contact phonon spectrum (a reliable and well-tested diagnostic method [28,29]) suggests l > ∼ 30 nm instead of WAM's 3 nm. (b) WAM attempted to explain (Cu.3a), the disappearence of the zero-bias anomalies under annealing, by assuming that the presumed static disorder anneals away at room temperature.…”

Section: Static Disordermentioning

confidence: 99%

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The 2-Channel Kondo Model

et al. 1998

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Certain zero-bias anomalies (ZBAs) in the voltage, temperature and magnetic field dependence of the conductance G(V, T, H) of quenched Cu point contacts have previously been interpreted to be due to non-magnetic 2-channel Kondo (2CK) scattering from near-degenerate atomic two-level tunneling systems (Ralph and Buhrman, 1992;, and hence to represent an experimental realization of the non-Fermi-liquid physics of the T = 0 fixed point of the 2-channel Kondo model. In this, the first in a series of three papers (I,II,III) devoted to 2-channel Kondo physics, we present a comprehensive review of the quenched Cu ZBA experiments and their 2CK interpretation, including new results on ZBAs in constrictions made from Ti or from metallic glasses. We first review the evidence that the ZBAs are due to electron scattering from stuctural defects that are not static, but possess internal dynamics. In order to distinguish between several mechanisms proposed to explain the experiments, we then analyze the scaling properties of the conductance at low temperature and voltage and extract from the data a universal scaling function Γ(v). The theoretical calculation of the corresponding scaling function within the 2CK model is the subject of papers II and III. The main conclusion of our work is that the properties of the ZBAs, and most notably their scaling behavior, are in good agreement with the 2CK model and clearly different from several other proposed mechanisms.

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Section: Experimental Facts For Quenched Cu Samplesmentioning

confidence: 79%

Section: Experimental Facts For Quenched Cu Samplesmentioning

confidence: 98%

“…Some aspects of the theory of transport through ballistic constrictions [28,29] are reviewed in Appendix A of paper II. Here we merely summarize the main conclusions.…”

Section: Ballistic Point Contact Spectroscopymentioning

confidence: 99%

Section: Static Disordermentioning

confidence: 99%

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The 2-Channel Kondo Model

et al. 1998

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“…The propagation of electron waves through such a junction reveals information on its chemical nature and electronic structure as well as mechanical properties [1]. This method has been applied to study metallic conductors [2][3][4], superconductors [5][6][7][8] and individual molecules [9][10][11][12] as well as carbon nanotubes [13] among others to understand multiple phenomena that can be observed solely at the nanoscale, including conductance quantization, the Coulomb blockade and the Andreev reflection.…”

Section: Introductionmentioning

confidence: 99%

Electron Transport in Magnetic Quantum Point Contacts

et al. 2012

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In recent years, the fabrication of novel building blocks for quantum computation-and spintronics devices gained significant attention. The ultimate goal in terms of miniaturization is the creation of single-atom functional elements. Practically, quantum point contacts are frequently used as model systems to study the fundamental electronic transport properties of such mesoscopic systems. A quantum point contact is characterised by a narrow constriction coupling two larger electron reservoirs. In the absence of a magnetic field, the conductance of these quantum point contacts is quantised in multiples of 2e 2 /h, the so-called conductance quantum (G 0 ). However, in the presence of magnetic fields the increased spin-degeneracy often gives rise to a deviation from the idealized behaviour and therefore leads to a change in the characteristic conductance of the quantum point contact. Herein, we illustrate the complex magnetotransport characteristics in quantum point contacts and magnetic heterojunctions. The theoretical framework and experimental concepts are discussed briefly together with the experimental results as well as potential applications.

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Understanding Metal/Metal Electrical Contact Conductance from the Atomic to Continuum Scales

Irving

2010

Reviews in Computational Chemistry

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Point-contact spectroscopy in metals

Cited by 404 publications

References 37 publications

The 2-Channel Kondo Model

The 2-Channel Kondo Model

Electron Transport in Magnetic Quantum Point Contacts

Understanding Metal/Metal Electrical Contact Conductance from the Atomic to Continuum Scales

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