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Andreev states and shot noise in bicrystal junctions of cuprate superconductors

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Abstract

Experimentally observed features of the electrical and noise characteristics of bicrystal junctions of cuprate superconductors, such as linearity of the critical current density versus square root of the junction transparency and increase in the spectral density of shot noise for small bias voltages (below the superconducting gap), indicate that the superconducting current in cuprate bicrystal junctions is determined by the passage of quasi-particles through a potential barrier at the superconductor boundaries. This process involves bound states appearing as a result of multiple Andreev reflections in superconductors with dominant wavefunction components of the d x 2 − y 2 symmetry type. At the same time, interpretation of the experimental current-phase and current-magnetic field curves requires that the character of faceting at the bicrystal junctions would be also taken into account.

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Authors and Affiliations

  1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009, Russia

    I. V. Borisenko, K. Y. Constantinian, Yu. V. Kislinskii & G. A. Ovsyannikov

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  1. I. V. Borisenko
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  2. K. Y. Constantinian
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  3. Yu. V. Kislinskii
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  4. G. A. Ovsyannikov
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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. 126, No. 6, 2004, pp. 1402–1412.

Original Russian Text Copyright © 2004 by Borisenko, Constantinian, Kislinski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\), Ovsyannikov.

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Borisenko, I.V., Constantinian, K.Y., Kislinskii, Y.V. et al. Andreev states and shot noise in bicrystal junctions of cuprate superconductors. J. Exp. Theor. Phys. 99, 1223–1232 (2004). https://doi.org/10.1134/1.1854810

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