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Structural order for one-scale and two-scale potentials

, : Structural order for one-scale and two-scale potentials. Physical Review Letters 95(13): 130604-130604

We perform molecular dynamics simulations to investigate the relationship between structural order and waterlike dynamic and thermodynamic anomalies in spherically symmetric potentials having either one or two characteristic length scales. Structural order is characterized by translational and orientational order parameters. We find that (i) dynamic and thermodynamic anomalies exist for both one-scale and two-scale ramp potentials, and (ii) waterlike structural order anomalies exist only for the two-scale ramp potential. Our findings suggest that the waterlike relationship between structural order and anomalies is related to the presence of two different length scales in the potential.


PMID: 16197129

DOI: 10.1103/PhysRevLett.95.130604

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