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Enhancement of Kondo Temperature in Nanometer-Size Point Contacts

  • I. K. Yanson
  • V. V. Fisun
  • J. A. Mydosh
  • J. M. van Ruitenbeek
Part of the NATO Science Series book series (NAII, volume 50)

Abstract

Recently, size effects in scattering of conduction electrons off magnetic impurities has gained a renewed interest [1, 2, 3, 4, 5, 6, 7]. The estimate for the characteristic size of Kondo interaction around paramagnetic impurities embedded in a normal metal equals in order of magnitude ξ K υ F /T K where T K is the characteristic energy scale and υ F is the Fermi velocity. In noble metals with dissolved impurities such as Mn, Cr, and Fe, T K can be quite small (down to ∼ 10−13 K in AuMn alloys [8]), leading to a macroscopic ξK which is easily accessible in experiments. The theory predicts that at low temperatures (T < T K ) the conduction electron spins create a “cloud” around each impurity which compensates the spin of the impurity [9]. At higher temperatures (TT K ), one might think that the same spatial scale determines the logarithmic behavior of the magnetic part of the resistivity as a function of temperature. It is unimportant that the average distance between impurities, even in the most dilute alloys, is much less than ξ K , since the wave functions of spin-screening conduction electrons at each impurity are mutually orthogonal. There are a number of experiments aiming to discover the changes of Kondo interaction across this characteristic spatial scale [2, 3, 10]. In spite of some controversy in experimental interpretation

Keywords

Contact Diameter Contact Size Kondo Temperature Characteristic Spatial Scale Kondo Resonance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • I. K. Yanson
    • 1
  • V. V. Fisun
    • 1
  • J. A. Mydosh
    • 2
  • J. M. van Ruitenbeek
    • 2
  1. 1.B. Verkin Institute for Low Temperature Physics and EngineeringNational Academy of SciencesKharkivUkraine
  2. 2.Kamerlingh Onnes LaboratriumLeiden UniversityLeidenThe Netherlands

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