Size Dependence of Kondo Scattering in Point Contacts

Yanson, I. K.; Fisun, V. V.; Hesper, Ronald; Khotkevich, A. V.; Krans, J. M.; Mydosh, J. A.; Ruitenbeek, J. M. van

doi:10.1103/physrevlett.74.302

Cited by 71 publications

(78 citation statements)

References 12 publications

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“…Magnetic impurities in metal break junctions have been observed to cause ZBAs that do not exhibit splitting because the Kondo temperature scale is larger than the Zeeman energy [63]. However the ZBA signals caused by these impurities are very different than the ones we investigate, because they exhibit Fermi liquid scaling (α = 2) rather than the α = 0.5 we measure.…”

Section: Magnetic Impuritiescontrasting

confidence: 40%

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: Magnetic Impuritiescontrasting

confidence: 40%

The 2-Channel Kondo Model

et al. 1998

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“…Experimental evidence for this splitting comes from the temperature dependence of the magnetoresistivity of Kondo impurities, which we shall discuss below. Point contact spectroscopy on dilute Kondo alloys [18] also indicates this splitting. At very low temperatures T < 0.25T K we find that H c is close to its T = 0 value, 0.5T K , and at higher temperatures is linear in temperature (H c (T ) ≈ 3T ).…”

Section: Method-the Technique We Use To Calculatementioning

confidence: 99%

Kondo Effect in a Magnetic Field and the Magnetoresistivity of Kondo Alloys

Costi¹

2000

Phys. Rev. Lett.

314

319

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The effect of a magnetic field on the spectral density of a S = 1/2 Kondo impurity is investigated at zero and finite temperatures by using Wilson's numerical renormalization group method. A splitting of the total spectral density is found for fields larger than a critical value Hc(T = 0) ≈ 0.5TK , where TK is the Kondo scale. The splitting correlates with a peak in the magnetoresistivity of dilute magnetic alloys which we calculate and compare with the experiments on CexLa1−xAl2, x = 0.0063. The linear magnetoconductance of quantum dots exhibiting the Kondo effect is also calculated.

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“…MCB junctions are widely used for singlemolecule, even single-atom devices including one-atom metallic point contacts [42][43][44][45][46][47][48][49][50] and metal-molecule-metal junctions. [28,33,41,[51][52][53][54][55][56][57] van Ruitenbeek et al [42][43][44][45][46][47][48][49] work distinguishably in this field, especially on making atomic size contacts and tunnel junctions.…”

Section: Mechanical Controllable Break Junctionsmentioning

confidence: 99%

“…[28,33,41,[51][52][53][54][55][56][57] van Ruitenbeek et al [42][43][44][45][46][47][48][49] work distinguishably in this field, especially on making atomic size contacts and tunnel junctions. The metallic point contacts were made by bringing two freshly prepared electrodes back into contact under precise adjustment of the piezo element.…”

Section: Mechanical Controllable Break Junctionsmentioning

confidence: 99%

Nanogap Electrodes

2009

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Nanogap electrodes (namely, a pair of electrodes with a nanometer gap) are fundamental building blocks for the fabrication of nanometer‐sized devices and circuits. They are also important tools for the examination of material properties at the nanometer scale, even at the molecular scale. In this review, the techniques for the fabrication of nanogap electrodes, the preparation of assembled devices based on the nanogap electrodes, and the potential application of these nanodevices for analysis of material properties are introduced. The history, the research status, and the prospects of nanogap electrodes are also discussed.

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Size Dependence of Kondo Scattering in Point Contacts

Cited by 71 publications

References 12 publications

The 2-Channel Kondo Model

The 2-Channel Kondo Model

Kondo Effect in a Magnetic Field and the Magnetoresistivity of Kondo Alloys

Nanogap Electrodes

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