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Rate exchange rather than relaxation controls structural recovery.

Birte Riechers1, Ranko Richert

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Structural recovery after an electric field step shows homogeneous dynamics, distinct from heterogeneous structural relaxation. This is explained by rate exchange, impacting models of aging and nonlinear dynamics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Structural relaxation and recovery are crucial phenomena in disordered materials.
  • Existing models often assume identical dynamics for relaxation and recovery, which is increasingly questioned.
  • Understanding these dynamics is vital for predicting material behavior under external stimuli.

Purpose of the Study:

  • To investigate the dynamics of structural recovery following an electric field step.
  • To determine if structural recovery dynamics are homogeneous or heterogeneous.
  • To reconcile the apparent conflict between relaxation and recovery dynamics.

Main Methods:

  • Probing the dielectric loss profile near its maximum after an electric field step.
  • Analyzing the frequency shift of the dielectric loss peak.
  • Applying time aging-time superposition (TaTS) analysis to relaxation modes.

Main Results:

  • An electric field step induced a shift in the dielectric loss profile towards lower frequencies, indicating structural recovery.
  • The majority of relaxation modes exhibited time aging-time superposition (TaTS), suggesting homogeneous recovery dynamics.
  • Structural recovery dynamics were found to be homogeneous, contrasting with heterogeneous structural relaxation.

Conclusions:

  • Structural recovery and structural relaxation involve distinct dynamic processes.
  • A novel mechanism, 'rate exchange,' is proposed to govern homogeneous structural recovery.
  • This finding necessitates revisions in models of aging and nonlinear dynamics, including scanning calorimetry.