Dipole-dipole interaction and magnetic ordering in KEr(MoO4)2. 2. Phase transitions in KEr(MoO4)2 induced by an external magnetic field

The model of magnetic structure of KEr(MoO4)2 developed in the preceding article in the approximation of a magnet with purely dipole-dipole spin-spin interactions and equivalent RE sites in a unit cell is used to analyze the phase transitions induced in this system by a magnetic field for H‖ a and H‖ c. It is shown that the magnetic nonequivalence of ions from neighboring chains which are not associated with an inversion center leads to a four-sublattice magnetic structure determining the metamagnetic phase transition for H‖ a. The angular dependence of the EPR spectrum is analyzed, and the angles of rotation of local axes of the crystal field for nonequivalent centers are estimated as well as the residual interchain exchange interaction. It is concluded that dipole-dipole interactions play a leading role in the formation of magnetic properties of this compound.

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