Functional integral method in itinerant electron magnetism

S Hirooka, M Shimizu
1988 Journal of Physics F Metal Physics  
Teynman's variational method and the arbitrariness of the Stratonovich-Hubbard transformation in the functional integral method are investigated. By making use of their results the dynamical spin susceptibility is given in the Gaussian approximation and it is applied to the calculation of the paramagnetic susceptibility of Ni.
doi:10.1088/0305-4608/18/10/013 fatcat:72lol3f7wna5bilwejj5qwvtvq