Anisotropic Spin-Flip Induced Multiferroic Behavior in Kagome Cu3Bi(SeO3)2O2Cl
H. C. Wu1*, K. D. Chandrasekhar1, J. K. Yuan1, J. R. Huang2, J.-Y. Lin2, H. Berger3, H. D. Yang1
1Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan
2Institute of Physics, National Chiao Tung University, Hsinchu, Taiwan
3Institute of Physics of Complex Matter, Ecole Polytechnique Federal de Lausanne, Lausanne, Switzerland
* presenting author:Hung-Cheng Wu,
Temperature and magnetic field dependent magnetization, specific heat, dielectric, magneto-dielectric, and ferroelectric properties were investigated on Kagome single crystal Cu3Bi(SeO3)2O2Cl. Without magnetic field, an antiferromagnetic transition is clearly established at TN ~ Above the critical field HC ~ 0.8 T, a metamagnetic spin-flip transition from antiferromagnetic to ferrimagnetic order at T ~ TN is induced anisotropically only for H // c. Simultaneously, a ferroelectric behavior is observed below T ~ TN, then a corresponding type-II multiferroics emerges above HC. The key mechanism of the anisotropic spin-flip induced multiferroicity in Cu3Bi(SeO3)2O2Cl can be ascribed to the breaking of magnetic two-fold symmetry in the bc plane above HC
Keywords: Kagome, Magnetic anisotropy, Spin flip, Multiferroic