Influence of Crystal Field on the Magnetic Circular Birefringence

Magnetic circular birefringence (MCB) is decomposed into diamagnetic and paramagnetic terms for arbitrary values of the fields on the atom and the influence of crystal field on these terms in considered. It is shown that a crystal field is the necessary condition for an existence of the temperature‐independent term in the paramagnetic part of MCB and the properties of this term are considered taking into account the mixing of states inside and between atomic terms. MCB for the transition 3d¹ → 4p¹ in the cubic octahedral crystal field is found taking into consideration the mixing of states inside the atomic terms. Field and temperature dependences of paramagnetic MCB are calculated for this case.