Correlations in the thermodynamical theory of phase transitions of the second kind. I

The geometrical approach to the thermodynamical theory of phase transitions of the second kind is further developed for the case when the first non-vanishing derivatives of the Gibbs potential w.r.t. the order parameter and w.r.t. the “critical” correlation parameter are of the fourth order. The critical exponents obtained are the same as in the Landau theory except α2, α′2 exponents which define λ-like peculiarity of the specific heat Cp(T) below as well as above the critical temperature.