Mechanisms of normal reflection at metal interfaces

III Международный семинар по микроконтактной спектроскопии<br>Харьков, Украина, 8–11 сентября 2014 г.


  • K. Gloos Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FIN-20014 Turku, Finland
  • E. Tuuli Turku University Centre for Materials and Surfaces (MatSurf), FIN-20014 Turku, Finland


Ключові слова:

point contacts, metal interfaces, normal reflection, Andreev reflection.


Andreev-reflection spectroscopy of elemental superconductors in contact with nonmagnetic normal metals reveals that the strength of normal-reflection varies only slightly. This observation imposes strong constrictions on the three possible normal-reflection mechanisms: tunneling through a dielectric barrier, reflection due to the different electronic properties of the two electrodes, and diffusive transport caused by elastic scattering in the contact region. We discuss in detail the role played by Fermi-surface mismatch, represented by the different Fermi velocities on both sides of the contact interface. We find that it is at least not the dominant mechanism and possibly completely absent in the Andreev-reflection process.


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Як цитувати

Gloos, K.; Tuuli, E. Mechanisms of Normal Reflection at Metal Interfaces: III Международный семинар по микроконтактной спектроскопии
Харьков, Украина, 8–11 сентября 2014 г. Fiz. Nizk. Temp. 2014, 40, 1155-1160.