Bondarenko V. Мagnetic dipole-dipole interaction in the double rare-earth molibdates CsDy(MoO4)2 and KEr(MoO4)2

Objects: double molibdates CsDy(MoO4)2 and KEr(MoO4)2. Goals: to determine the role of magnetic dipole-dipole interaction in the formation of the magnetic ordered phase and magnetic properties of the double molibdates CsDy(MoO4)2 and KEr(MoO4)2. Methods: EPR, specific heat, numerical calculations. New results: The energy and magnetic structure of the ground state of the magnetic ordered phase of CsDy(MoO4)2 and KEr(MoO4)2 are found in the dipole approximation. The magnetic field dependences of the magnetization of these compounds are calculated at T = 0 K. Magnetic transition temperature of KEr(MoO4)2 and exchange parameters in this system have been determinated from specific heat investigation of this compound. H-T phase diagram of KEr(MoO4)2 have been made. The additional contribution in the specific heat of KEr(MoO4)2 which connected with chains clasterization processes is analysed in short magnetic order region.