Confirmation of anomalous dynamical arrest in attractive colloids: A molecular dynamics study

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

Volumn 66, Issue 4, 2002, Pages 14-

  Zaccarelli, E ^a   Foffi, G ^a,b   Dawson, K A ^b   Buldyrev, S V ^c   Sciortino, F ^a   Tartaglia, P ^a  

^a UNIVERSITÀ DI ROMA LA SAPIENZA   (Italy)

^b UNIVERSITY COLLEGE DUBLIN   (Ireland)

^c Boston University   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

GEOMETRICAL ARRANGEMENTS; LIQUID-GAS SEPARATION; LOGARITHMIC SINGULARITY; MEAN-SQUARE DISPLACEMENT (MSD);

APPROXIMATION THEORY; COLLOIDS; COMPUTER SIMULATION; CORRELATION METHODS; FUNCTIONS; MATHEMATICAL MODELS; PHASE DIAGRAMS;

MOLECULAR DYNAMICS;

ARTICLE;

EID: 41349103382     PISSN: 1063651X     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevE.66.041402     Document Type: Article

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54. We note that this value is slightly higher than that one observed in Fig. 1111(b), because here we are looking at a point slightly less close to the glass transition; thus localization is a bit less effective for this case. However, whenever localization due to attractive glass transition happens, the value of the MSD at the plateau is always smaller than (Formula presented)
55. We note that, by using the stretched exponential law, a good fit of the correlators can be obtained. However, the parameters that are found from the fits are completely unreliable. In particular, for the amplitude parameter, which should give an estimate of the nonergodicity parameter, we find for every q vector, the value 1. Thus, we must exclude the validity of these fits.
56. This is due to the fact that at (Formula presented) and in general for attractive glasses, the nonergodicity factor decays extremely slowly, and it is not possible to do so within the present figure. However, the oscillations might be more evident in Fig. 1414 even at this temperature.