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1/f noise and dynamical heterogeneity in glasses
G Careri1, G Consolini, Z Kutnjak
1Dipartimento di Fisica, Università di Roma La Sapienza, INFM Unità di Roma Uno, 00185 Rome, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
Summary
Researchers explored the link between dipolar noise (1/f(alpha)) and relaxation time ranges (Delta(z)) in various glasses. A consistent trend was observed across different glass types, offering insights into dynamical heterogeneity.
Area of Science:
- Condensed matter physics
- Materials science
- Statistical mechanics
Background:
- Dynamical heterogeneity is a key characteristic of disordered systems near the glass transition.
- Dielectric and magnetic responses often exhibit nonexponential behavior, described by 1/f(alpha) noise.
- The range of relaxation times, Delta(z), is another indicator of dynamical heterogeneity.
Purpose of the Study:
- To investigate the relationship between the coefficient alpha of 1/f(alpha) dipolar noise and the range of relaxation times, Delta(z).
- To determine if this relationship holds across diverse glassy systems.
Main Methods:
- Analysis of experimental data from various glass types.
- Characterization of dipolar noise using the coefficient alpha.
- Quantification of relaxation time distribution using Delta(z).
Main Results:
- A consistent trend was identified between the coefficient alpha and Delta(z) across different classes of glasses.
- This relationship was observed in spin glasses, proton glasses, relaxor materials, and glass-forming liquids.
- The findings suggest a universal behavior in dynamical heterogeneity.
Conclusions:
- The coefficient alpha of 1/f(alpha) dipolar noise is intrinsically linked to the range of relaxation times, Delta(z).
- This relationship provides a unifying perspective on dynamical heterogeneity in diverse glassy systems.
- The study highlights potential for using these parameters to understand glass transition physics.