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Deformation of a charge density wave in the vicinity of a point contact with a normal metal

  • Electronic Properties of Solids
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Abstract

The current-voltage characteristics of Cu-K0.3MoO3 point contacts between a metal and a semiconductor with a charge density wave (CDW) are studied for various diameters of the contacts in a wide range of temperatures T and voltages V. In the interval 80 K ≲ T ≲ 150 K, the current-voltage characteristics are correctly described in the framework of a semiconductor model: screening of an external electric field causes CDW deformation, shifts the chemical potential of quasiparticles, and changes the point contact resistance. It is shown that the chemical potential is above the middle of the Peierls gap in equilibrium and approaches the middle upon an increase in temperature. The current-voltage characteristics of point contacts with a diameter d ≳ 100 Å exhibit a sharp decrease in resistance for |V| > V t , which is associated with the beginning of local CDW sliding within the contact region. The V t (d, T) dependence can be explained by the size effect in the CDW phase slip.

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Authors and Affiliations

  1. Moscow Engineering Physics Institute, Moscow, 115409, Russia

    A. A. Sinchenko

  2. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 103907, Russia

    V. Ya. Pokrovskii

Authors
  1. A. A. Sinchenko
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  2. V. Ya. Pokrovskii
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__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 128, No. 6, 2005, pp. 1288–1298.

Original Russian Text Copyright © 2005 by Sinchenko, Pokrovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\).

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Sinchenko, A.A., Pokrovskii, V.Y. Deformation of a charge density wave in the vicinity of a point contact with a normal metal. J. Exp. Theor. Phys. 101, 1130–1139 (2005). https://doi.org/10.1134/1.2163928

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