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Peak effect in a driven lattice gas model.

Mario Nicodemi1

  • 1Dipartimento di Fisica, Università Federico II, INFM and INFN, Via Cintia, 80126 Napoli, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 6, 2003
PubMed
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The peak effect in driven lattice gas models signifies a first-order phase transition, impacting critical current and magnetic hysteresis. This study links these phenomena to system timescales and vortex lines in superconductors.

Area of Science:

  • Condensed Matter Physics
  • Statistical Mechanics

Background:

  • The peak effect (PE) is a phenomenon observed in the critical current of driven systems.
  • Understanding the origins of PE is crucial for materials science and condensed matter physics.

Purpose of the Study:

  • To investigate the peak effect (PE) in a driven lattice gas model.
  • To connect the PE to phase transitions and magnetic hysteresis.
  • To explain history-dependent phenomena in the PE region.

Main Methods:

  • Analysis of transport properties in a driven lattice gas model.
  • Identification of phase transitions in the equilibrium, undriven system.
  • Investigation of system characteristic timescales and their dependence on temperature and external field.

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Main Results:

  • The PE in the driven system corresponds to a first-order phase transition in the equilibrium system.
  • An anomalous second peak in magnetic hysteresis loops is linked to this phase transition.
  • History-dependent phenomena are explained by diverging system timescales at low temperatures and a broad maximum around the PE.

Conclusions:

  • The study provides a theoretical framework for understanding the peak effect in driven lattice gas models.
  • The findings offer insights into the behavior of vortex lines in superconductors.
  • The research connects equilibrium phase transitions to non-equilibrium transport phenomena.