Investigation of the anomalies of the magnetoelectric and magnetoelastic properties of single crystals of the ferroborate GdFe3(BO3)4 at phase transitions

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Abstract
The transformation of various properties of gadolinium ferroborate single crystals at phase transitions, both spontaneous and induced by magnetic fields up to 200 kOe, is investigated theoretically and experimentally. Particular attention is paid to elucidating the role of magnetoelectric interactions and the change in them at spin-reorientation transitions accompanied by a change of magnetic symmetry. With that goal the magnetoelastic and magnetoelectricproperties of the system are investigated over a wide range of temperatures for two orientations of the magnetic field, H∥c and H⊥c, and a fundamental difference of the character of the field dependences of the magnetostriction and electric polarization is found. In the framework of a symmetry approach a description of the magnetic structures and their transformations in the system GdFe 3 ( BO 3 ) 4 is proposed, and an interpretation of the experimentally observed properties is given.