Magnetic-structure instability resulting from the intersection of energy levels
Zvezdin A.K., Mukhin A.A., Popov A.I.
We investigated the instability of the magnetic structure of a ferrimagnetic crystal (of the iron-garnet type), which is produced in a magnetic field when the lower energy levels of one of the sublattices intersect. This phenonmenon is the magnetic analog of the Jahn-Teller effect. The phase diagram of this system is constructed.