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Instanton glass generated by noise in a Josephson-junction array.

E M Chudnovsky1

  • 1Physics Department, Lehman College, The City University of New York, Bronx, New York 10468-1589, USA.

Physical Review Letters
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

We studied superconducting order parameter correlations in Josephson-junction arrays with noise. At low temperatures and strong coupling, correlations decay exponentially, forming a collective Cooper-pair insulator state.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Josephson-junction arrays are crucial for understanding superconductivity.
  • The influence of noise on superconducting states is a key research area.
  • Disordered superconducting films exhibit unique electronic properties.

Purpose of the Study:

  • To compute the correlation function of the superconducting order parameter.
  • To investigate the behavior of a 2D Josephson-junction array model with Gaussian noise.
  • To characterize the low-temperature state under strong Josephson coupling.

Main Methods:

  • Utilized a continuous model for a 2D Josephson-junction array.
  • Incorporated weak Gaussian noise into the model.
  • Computed the correlation function in Euclidean space.

Main Results:

  • Found that correlations decay exponentially at low temperatures when Josephson coupling is large.
  • Demonstrated that this exponential decay is independent of noise strength.
  • Identified this state as a collective Cooper-pair insulator.

Conclusions:

  • The collective Cooper-pair insulator state exhibits properties similar to disordered superconducting films.
  • This finding provides insights into the nature of superconductivity in noisy, disordered systems.
  • The study highlights the robustness of the superconducting state under specific conditions.