Neutron diffraction, magnetic, and magnetoelectric studies of phase transitions in multiferroic Mn0.90Co0.10WO4

作者：Urcelay Olabarria I^*; Ressouche E; Mukhin A A; Ivanov V Yu; Balbashov A M; Vorobev G P; Popov Yu F; Kadomtseva A M; Garcia Munoz J L; Skumryev V

来源：Physical Review B, 2012, 85(9): 094436.

DOI：10.1103/PhysRevB.85.094436

We have studied various spontaneous and magnetic-field-induced phase transitions in single crystals of multiferroic Mn0.9Co0.1WO4 using magnetic and magnetoelectric measurements and neutron diffraction. Compared to pure MnWO4, our data consistently confirm that the anisotropic Co2+ ions induce reorientation of the spin cycloid structure to the ac plane and reveal P-a and P-c components of spontaneous electric polarization. Field-induced phase transitions accompanied by anomalies of magnetic susceptibility and suppression of both P-a and P-c polarizations have been observed for H parallel to c (similar to 3 T) and H parallel to a (similar to 8.5 T). Neutron diffraction has revealed that in both cases the spin cycloid plane flops in direction almost perpendicular to H, i.e., close to the ab and bc planes, respectively. Parameters describing the magnetic structures including wave vectors, orientations of the main elliptical axes, etc., have been determined in all spontaneous and field-induced states.

• 出版日期2012-3-30
• 单位中国地震局