Dislocation lines as the precursor of the melting of crystalline solids observed in Monte Carlo simulations

Details Dislocation lines as the precursor of the melting of crystalline solids observed in Monte Carlo simulations Dislocation lines as the precursor of the melting of crystalline solids observed in Monte Carlo simulations

2003-02-26

arxiv.org/abs/cond-mat/0302541v1

Physics

Condensed Matter

Materials Science

5 pages, 5 figures, accepted in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.095701

The microscopic mechanism of the melting of a crystal is analyzed by the constant pressure Monte Carlo simulation of a Lennard-Jones fcc system. Beyond a temperature of the order of 0.8 of the melting temperature, we found that the relevant excitations are lines of defects. Each of these lines has the structure of a random walk of various lengths on an fcc defect lattice. We identify these lines with the dislocation ones proposed in recent phenomenological theories of melting. Near melting we find the appearance of long lines that cross the whole system. We suggest that these long lines are the precursor of the melting process.

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