%0 Journal Article %T A non-classical van der Waals loop: Collective variables method %A R.V. Romanik %A M.P. Kozlovskii %J Condensed Matter Physics %D 2013 %I Institute for Condensed Matter Physics %X The equation of state is investigated for an Ising-like model in the framework of collective variables method. The peculiar feature of the theory is that a non-classical van der Waals loop is obtained. The results are compared with ones of a trigonometric parametric model, in terms of normalized magnetization, M, and field, H. %K Van der Waals loop %K non-classical critical behavior %K scalar order parameter %U http://dx.doi.org/10.5488/CMP.16.14001