Journal of Physics: Conference Series 726
, 012016 (2016)
Ginzburg-Landau functional for three order parameter problem
Nguyen Van Hinh and Nguyen Tri Lan
A model is presented utilizing a generic Hamiltonian with equal pairings in channels
based on quantum field theory and functional integral formalism, to show the correlation among
the order parameters which are described in multi-component Ginzburg-Landau functional. In the vicinity of the phase transition, the further perturbative expansions of the functional around the mean-field theory in the auxiliary fields are carried out with the aim of leading to a possible solution for the coexistence of many phases. The work is motivated by the recent theoretical researches and experimental evidences of the coexistence of superconductivity and ferromagnetism in U and Ce compounds.