$^{51}$V single-crystal NMR Study on multiferroic FeVO$_4$

ORAL

Abstract

The multiferroicity in FeVO$_4$ is so far not well understood because its spin-orbit coupling is probably very weak. In this talk, we report our $^{51}$V single crystal NMR study on FeVO$_4$ under zero field and a finite field. The double magnetic transitions with $T_{SDW}\approx$ 19 K and $T_{helical}\approx$ 13 K are clearly shown by NMR spectra and the spin-lattice relaxation rate $1/T_1$. Two noneqivalent $^{51}$V sites are identified with different hyperfine couplings. Just below $T_{helical}$, a large RF enhancement is seen, which indicates rich magnetic domain walls formed in the helical state and not in the SDW state. Based on our results, we discuss the coupling between the magnetism and the ferro-electricity in FeVO$_4$.

–

Authors

  • Jinshan Zhang

    • School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China

  • Long Ma

    • Department of Physics, Renmin University of China, Beijing, China

  • Weiqiang Yu

    • Department of Physics, Renmin University of China, Beijing, China
    • Department of Physics, Renmin University of China, Beijing 100872, China

  • Zhangzhen He

    • State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fujian, China