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Ballistic Transport in Normal Metals

  • P. Wyder
  • A. G. M. Jansen
  • H. van Kempen
Part of the NATO ASI Series book series (NSSB, volume 285)

Abstract

Using micro-contacts (“point contacts”) between metals, conduction electrons can be injected ballistically into the metal; the relevant energy of these electrons can be tuned by varying the applied voltage. With the injected electrons it is possible to perform spectroscopy inside the metal just as it has usually been done with electrons, neutrons or photons from the outside. The observed deviations from Ohm’s law in the tiny metallic contacts allow an energy-resolved spectroscopy of the interaction of the conduction electrons with elementary excitations (e.g. phonons, magnons, paramagnetic impurities, crystal-field levels, etc.) in a metal. In reasonable pure normal metals, the observed second derivative signal d2V/dI2(V) is directly proportional to Eliashberg’s form of the electron-phonon interaction α2F(eV) with a slight modification due to a transport efficiency function. The point-contact method and its applications will be discussed. Specific experiments will show the usefulness of ballistic point-contacts for other purposes than just spectroscopy: high-frequency rectification with a point contact as a non-linear element, electron-focusing using a double point-contact setup, the study of interfaces (Andreev reflection), localization phenomena in a constriction, magnetoresistance of a point contact.

Keywords

Point Contact Contact Resistance Normal Metal Ballistic Transport Andreev Reflection 
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 New York 1991

Authors and Affiliations

  • P. Wyder
    • 1
  • A. G. M. Jansen
    • 1
  • H. van Kempen
    • 2
  1. 1.Max-Planck-Institut für FestkörperforschungHochfeld-MagnetlaborGrenoble CedexFrance
  2. 2.Res. Institute for MaterialsUniv. of Nijmegen ToernooiveldNijmegenThe Netherlands

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