Glass- and crystal-forming model based on a granular two-dimensional system.
A Escobar1, C Tapia-Ignacio1, F Donado1
1Instituto de Ciencias Básicas e Ingeniería de la Universidad Autónoma del Estado de Hidalgo-AAMF, Pachuca 42184, Pachuca, México.
Physical Review. E
|June 25, 2020
Summary
This study on magnetic particles reveals cooling rate influences final states. Slow cooling yields hexagonal structures, while fast cooling results in glasslike states, impacting particle arrangement.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
- Soft Matter Physics
Background:
- Investigating phase transitions in two-dimensional systems.
- Understanding the behavior of magnetic particles under external fields.
- Exploring the influence of cooling rates on system configurations.
Purpose of the Study:
- To analyze the effect of cooling rates on the final states of a 2D magnetic particle system.
- To determine the glass transition temperature as a function of cooling rate.
- To observe changes in interparticle distance during system evolution.
Main Methods:
- Utilizing a 2D system of magnetic particles on a negative lens.
- Applying an alternating magnetic field to control effective temperature.
- Cooling the system from a gaslike to a solidlike state at varying rates.
- Monitoring system evolution and interparticle distances over time.
Main Results:
- Observed hexagonal compact arrangements at slow cooling rates.
- Identified glasslike states at faster cooling rates.
- Determined that glass transition temperature increases with decreasing cooling rate, contrary to typical glass-forming liquids.
Conclusions:
- Cooling rate critically dictates the final structural configuration of the 2D magnetic particle system.
- The observed inverse relationship between glass transition temperature and cooling rate offers new insights into non-equilibrium physics.
- This system provides a model for studying glass transitions in driven soft matter systems.
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