Abstract
Adopting the effective Hamiltonian by Pryce and the molecular field approximation, the parallel and perpendicular susceptibilities of FeF 2 are calculated. According to the experiments by Stout and Matarrese, the perpendicular susceptibility below the Neel point decreases with decreasing temperature. Denoting the components of the D -tensor in Pryce's effective Hamiltonian by D i ( i = x , y , z ) where the z -axis is taken as the c -axis and the x -axis as the direction of the line connecting two nearest neighbouring F ions, this behaviour of the perpendicular susceptibility can be explained if D x , D y > D z . The parallel susceptibility at absolute zero has a non-zero value proportional to ( D x – D y ) 2 . However this term is of the same or small order compared with the temperature-independent part of the magnetic susceptibility. Comparisons with experiments are made by using the values of the D -tensor and the g -factor obtained by Tinkham. If the reasonable values of exchange integrals are adopted...
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