Investigation of a critical behaviour of n-component model of magnetics. 2.calculation of the rfee energy at temperatures T > T_c

摘要

Investigation of a critical behaviour of n-component 3D model of magnetics in the vicinity of the phase transition at temperatures T > T_c is performed. Calculations are performed in the spirit of the renormalization group approach with using the method of collective variables. The phase transition temperature and critical exponents values are calculated. Calculation of the free energy is performed and explicit analytic Expressions for the thermodynamic functions of the system as function of The temperature, external field. and number of order parameter Components are obtained. The dependence of the obtained values on Microscopic parameters of the system is investigated. Calculations were Performed within the p~4-model.