ABSTRACT
It has been found that DyFeO3 shows a very strong multiferroic effect due to the weak-antiferromagnetic order of Fe ions [1]. However, a direct microscopic determination of the magnetic order is absent. We report a combined neutron scattering and magnetization study on DyFeO3, applying magnetic field along the c axis as in the original study [1]. The weak ferromagnetic order of the Fe ions is quickly recovered from a spin reorientation transition, and the long-range antiferromagnetic order of Dy becomes a short-range one [2]. We found that the short-range order concurs with the strong multiferroic phase and is responsible for its sizable hysteresis. Our H-T phase diagram indicates that the strong magnetoelectric effect in DyFeO3 is induced by not only the weak ferromagnetism of Fe, but also the more important short-range antiferromagnetic order of Dy.
- Y. Tokunaga, S. Iguchi, T. Arima, and Y. Tokura, Phys. Rev. Lett. 101, 097205 (2008).
- Jinchen Wang et al., Phys. Rev. B 93, 140403(R) (2016).
BIOGRAPHY
Prof. Wei Bao obtained B.Sc in astrophysics from Peking University, his M.S. from Institute of Theoretical Physics, Chinese Academy of Sciences, and his Ph.D. from the Johns Hopkins University. He was a consultant in the AT&T Bell Labs., Murray Hill, NJ in 1994, a postdoctoral fellow at Brookhaven National Lab. from 1995 to 1998, a technical staff member at Los Alamos National Lab. from 1998 to 2009, and a National Qianren Professor at Renmin University since 2009. Prof. Bao is a Fellow of American Physics Society. He serves in three subject executive committees of Chinese Physics Society and is a member of the Science and Technology Committee of the Department of Education, PRC. Prof. Bao has worked mainly on correlated electron systems and disordered quantum systems subjected to the extreme conditions of low temperature, high pressure, and high magnetic field, using various types of neutron scattering techniques at most major international neutron user facilities over the world. He published 70 papers on the Mott-Hubbard Metal-Insulator Transition, CMR, orbital order, reentrant spin glass, itinerant magnetism, low-dimensional quantum antiferromagnets, and novel superconductivity in heavy-fermion, cuprate and Fe-based materials with more than 6700 citations. He has delivered more than 180 lectures in international conferences, colloquia and seminars. In addition to frontier research in condensed matter physics, he is currently leading the ￥ 130M project of the design and construction of a suite of cold neutron inelastic neutron spectrometers at CARR outside Beijing.