Cooperative jumps and hop-back motion in supercooled liquids near the glass transition in binary colloids
Physics, Indian Institute of Science - Bangalore 560 012, India
Accepted: 21 March 1996
Brownian Dynamics simulations on binary charged colloids have been performed to get a liquid to crystal (at volume fraction ) or glass () as the temperature is lowered. The subdiffusive and staircase behaviours of the mean-squared displacements as well as the behaviour of van-Hove self-correlation functions for the supercooled liquid with indicate strongly cooperative particle motion. The van-Hove distinct correlations follow a factorization property predicted by the mode-coupling theory. Most interestingly, a few particles show an interconnected cooperative hop and subseqent hop-back motion very close to the glass transition.
PACS: 64.70.Pf – Glass transitions / 61.20.Ja – Computer simulation / 64.70.Dv – Solid-liquid transitions
© EDP Sciences, 1996