Manipulating Multiple Order Parameters via Oxygen Vacancies: The case of Eu0.5Ba0.5TiO3-{\delta}
Abstract
Controlling functionalities, such as magnetism or ferroelectricity, by means of oxygen vacancies (VO) is a key issue for the future development of transition metal oxides. Progress in this field is currently addressed through VO variations and their impact on mainly one order parameter. Here we reveal a new mechanism for tuning both magnetism and ferroelectricity simultaneously by using VO. Combined experimental and density-functional theory studies of Eu0.5Ba0.5TiO3-{\delta}, we demonstrate that oxygen vacancies create Ti3+ 3d1 defect states, mediating the ferromagnetic coupling between the localized Eu 4f7 spins, and increase an off-center displacement of Ti ions, enhancing the ferroelectric Curie temperature. The dual function of Ti sites also promises a magnetoelectric coupling in the Eu0.5Ba0.5TiO3-{\delta}.
Cite
@article{arxiv.1708.08235,
title = {Manipulating Multiple Order Parameters via Oxygen Vacancies: The case of Eu0.5Ba0.5TiO3-{\delta}},
author = {Weiwei Li and Qian He and Le Wang and Huizhong Zeng and John Bowlan and Langsheng Ling and Dmitry A. Yarotski and Wenrui Zhang and Run Zhao and Jiahong Dai and Junxing Gu and Shipeng Shen and Haizhong Guo and Li Pi and Haiyan Wang and Yongqiang Wang and Ivan A. Velasco-Davalos and Yangjiang Wu and Zhijun Hu and Bin Chen and Run-Wei Li and Young Sun and Kuijuan Jin and Yuheng Zhang and Hou-Tong Chen and Sheng Ju and Andreas Ruediger and Daning Shi and Albina Y. Borisevich and Hao Yang},
journal= {arXiv preprint arXiv:1708.08235},
year = {2017}
}
Comments
Accepted by Physical Review B, 2017