1 Institute for Advanced Materials, Hubei Normal University, Huangshi 435002, China;2 Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;3 Institute for Advanced Materials, South China Normal University, Guangzhou 510006, China>
The multiferroicity in the RMn2O5 family remains unclear, and less attention has been paid to its dependence on high-temperature (high-T) polarized configuration. Moreover, no consensus on the high-T space group symmetry has been reached so far. In view of this consideration, one may argue that the multiferroicity of RMn2O5 in the low-T range depends on the poling sequence starting far above the multiferroic ordering temperature. In this work, we investigate in detail the variation of magnetically induced electric polarization in GdMn2O5 and its dependence on electric field poling routine in the high-T range. It is revealed that the multiferroicity does exhibit qualitatively different behaviors if the high-T poling routine changes, indicating the close correlation with the possible high-T polarized state. These emergent phenomena may be qualitatively explained by the co-existence of two low-T polarization components, a scenario that was proposed earlier. One is the component associated with the Mn3+-Mn4+-Mn3+ exchange striction that seems to be tightly clamped by the high-T polarized state, and the other is the component associated with the Gd3+-Mn4+-Gd3+ exchange striction that is free of the clamping. The present findings may offer a different scheme for the electric control of the multiferroicity in RMn2O5.
Project supported by the National Natural Science Foundation of China (Grant Nos. 11804088, 11234005, 11374147, 51431006, and 11704109), the National Key Research Program of China (Grant No. 2016YFA0300101), and the Research Project of Hubei Provincial Department of Education, China (Grant No. B2018146).
Xiang Li, Shuhan Zheng, Liman Tian, Rui Shi, Meifeng Liu, Yunlong Xie, Lun Yang, Nian Zhao, Lin Lin, Zhibo Yan, Xiuzhang Wang, Junming Liu. Unusual tunability of multiferroicity in GdMn2O5 by electric field poling far above multiferroic ordering point[J]. Chin. Phys. B, 2019, 28(2): 027502.