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The microscopic mechanism of the melting of a crystal is analyzed by theconstant pressure Monte Carlo simulation of a Lennard-Jones fcc system. Beyonda temperature of the order of 0.8 of the melting temperature, we found that therelevant excitations are lines of defects. Each of these lines has thestructure of a random walk of various lengths on an fcc defect lattice. Weidentify these lines with the dislocation ones proposed in recentphenomenological theories of melting. Near melting we find the appearance oflong lines that cross the whole system. We suggest that these long lines arethe precursor of the melting process.Comment: 5 pages, 5 figures, accepted in Physical Review Letter

Dislocation Lines as the Precursor of the Melting of Crystalline Solids Observed in Monte Carlo Simulations