We report discovery of collinear-magnetism-driven ferroelectricity in the Ising chain magnet Ca3Co2-xMnxO6 (x 0.96). Neutron diffraction shows that Co2+ and Mn4+ ions alternating along the chains exhibit an up-up-down-down († †) magnetic order. The ferroelectricity results from the inversion symmetry breaking in the († †) spin chain with an alternating charge order. Unlike in spiral magnetoelectrics where antisymmetric exchange coupling is active, the symmetry breaking in Ca3(Co,Mn)2O6 occurs through exchange striction associated with symmetric superexchange.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)