Uniaxial-stress control of spin-driven ferroelectricity in multiferroic Ba(2)CoGe(2)O(7).
We have demonstrated that spin-driven ferroelectricity in a tetragonal multiferroic Ba(2)CoGe(2)O(7) is controlled by applying uniaxial stress. We found that the application of compressive stress along the [110] direction leads to a 45° or 135° rotation of the sublattice magnetization of the staggered antiferromagnetic order in this system. This allows the spontaneous electric polarization to appear along the c axis. The present study suggests that an application of anisotropic stress, which is the simplest way to control symmetry of matter, can induce a variety of cross-correlated phenomena in spin-driven multiferroics.
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
Taro
T
Nakajima
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
Yusuke
Y
Tokunaga
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan and Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budapest H-1111, Hungary.
Vilmos
V
Kocsis
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
Yasujiro
Y
Taguchi
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan and Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan.
Yoshinori
Y
Tokura
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan and Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan.
Taka-Hisa
TH
Arima