Size-effect of Kondo scattering in point contacts (revisited)

The size-effect of Kondo-scattering in nanometer-sized metallic point contacts is measured with the simplified, mechanically-controlled break-junction technique for CuMn alloy of different Mn concentrations: 0.017; 0.035; and 0.18 (\(\pm\)0.017) at.\%. The results are compared with our previous publ...

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Bibliographic Details
Published in:arXiv.org 2017-02
Main Authors: Yanson, I K, Fisun, V V, Bobrov, N L, Mydosh, J A, van Ruitenbeek, J M
Format: Article
Language:English
Subjects:
Contact pressure
Kondo effect
Nanowires
Orifices
Phonons
Resonance scattering
Size effects
Online Access:Get full text
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Summary:The size-effect of Kondo-scattering in nanometer-sized metallic point contacts is measured with the simplified, mechanically-controlled break-junction technique for CuMn alloy of different Mn concentrations: 0.017; 0.035; and 0.18 (\(\pm\)0.017) at.\%. The results are compared with our previous publication on nominally 0.1 at.\% CuMn alloy \cite{1,2}. The increase of width of the Kondo resonance and enhanced ratio of Kondo-peak intensity to electron-phonon scattering intensity is observed for contacts with sizes smaller than 10 \(nm\). From the comparison of electron-phonon scattering intensity for the pressure-type contacts, which correspond to the clean orifice model, we conclude that the size effect is observed in \emph{clean} contacts with the shape of a \emph{channel} (nanowire).
ISSN:2331-8422
DOI:10.48550/arxiv.1702.03827