| Popis: |
Using the vanishing of the surface shear modulus as a criterion for surface melting, we studied the (111) and (001) faces of Lennard-Jones crystals using Monte Carlo simulation methods. It turns out that on both faces the surface layer melts below the bulk melting point. Taking Lennard-Jones parameters relevant for argon, we find that the surface shear modulus vanishes at 63± 1 K and 64±2 K for the (111) and the (001) surface, whereas the bulk melting point is estimated to be 72±1 K. Rough estimates for the melting points of the second layer are 71±1 K and 70±2 K for (111) and (001) surfaces, respectively. |
