Abstract
In the framework of a mean-field theory of the Landau-type, we study melting of a system of slab geometry; it is found that a slab-shaped solid made of a material, which shows the surface-induced melting like Pb, exhibits the two-stage phase transition: first, it begins to melt from the surface, i.e. surface-induced melting, and grows its liquid-layer thickness to a certain extent (a continuous transition). Second, it abruptly melts completely (a first-order transition). The transition temperature of the second stage, i.e. the melting temperature of a slab system, is suppressed as the slab thickness decreases; this is the size effect as well known in the melting of fine particles.
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