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arXiv · 1702.03827

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

I. K. Yanson·V. V. Fisun·N. L. Bobrov·J. A. Mydosh·J. M. van Ruitenbeek
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Abstract

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).

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I. K. Yanson, V. V. Fisun, N. L. Bobrov, J. A. Mydosh, J. M. van Ruitenbeek. 2017-02-13. Size-effect of Kondo scattering in point contacts (revisited). https://doi.org/10.1063/1.593630

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