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Vortex glass transition in a random pinning model.

Anders Vestergren1, Jack Lidmar, Mats Wallin

  • 1Condensed Matter Theory, Royal Institute of Technology, SCFAB, SE-106 91 Stockholm, Sweden.

Physical Review Letters
|March 23, 2002
PubMed
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We investigated the vortex glass transition in high-temperature superconductors using simulations. Our findings reveal new critical exponents distinct from the gauge glass model, closely matching the 3D XY model.

Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Disordered Systems

Background:

  • High-temperature superconductors exhibit complex phase transitions.
  • Understanding the vortex glass transition is crucial for applications.
  • Disorder plays a significant role in superconducting properties.

Purpose of the Study:

  • To investigate the vortex glass transition in disordered high-temperature superconductors.
  • To determine critical exponents at the phase transition.
  • To compare the results with existing theoretical models.

Main Methods:

  • Monte Carlo simulations were employed.
  • A random pinning model with strong point-correlated quenched disorder was used.
  • Finite size scaling analysis of helicity modulus, rms current, and resistivity was performed.

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Main Results:

  • New critical exponents characterizing the vortex glass transition were obtained.
  • The determined exponents differ significantly from those of the gauge glass model.
  • The exponents closely resemble those of the pure three-dimensional XY model.

Conclusions:

  • The study provides new insights into the nature of the vortex glass transition in disordered superconductors.
  • The findings suggest a universality class shared with the 3D XY model for this transition.
  • The results highlight the importance of long-range vortex interactions and specific disorder models.