Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-07-22
Phys. Rev. B, 59 (1999) 8593-8601
Physics
Condensed Matter
Statistical Mechanics
17 pages, 3 EPS figures, Latex file, continuation of Phys. Rev. B57, 13527 (1998) (cond-mat/9707015), submitted to Phys. Rev.
Scientific paper
10.1103/PhysRevB.59.8593
In this work we classify the singularities obtained from the Gibbs potential of a lattice gas model with three components, two order parameters and five control parameters applying the general theorems provided by Catastrophe Theory. In particular, we clearly establish the existence of Landau potentials in two variables or, in other words, corank 2 canonical forms that are associated to the hyperbolic umbilic, D_{+4}, its dual the elliptic umbilic, D_{-4}, and the parabolic umbilic, D_5, catastrophes. The transversality of the potential with two order parameters is explicitely shown for each case. Thus we complete the Catastrophe Theory analysis of the three-component lattice model, initiated in a previous paper.
Gaite Jose
Margalef-Roig J.
Miret-Artes Salvador
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