Magnetic Toroidal Moment under Partial Magnetic Order in Hexagonal Zigzag-Chain Compound Ce<sub>3</sub>TiBi<sub>5</sub>
Satoru Hayami, Hiroaki Kusunose
Abstract
We theoretically investigate an antiferromagnetic structure in a hexagonal zigzag-chain compound Ce3TiBi5, which shows a linear magnetoelectric effect in metals and a characteristic temperature dependence of magnetic susceptibility. We find a partial magnetic order as a coexistence of a nonmagnetic state on a zigzag chain and staggered antiferromagnetic state on zigzag chains. The latter accompany in-plane magnetic toroidal dipole moments which are responsible for the observed behaviors. We show that magnetic frustration arising from competing exchange interactions plays an important role to realize such a partial magnetic order. Furthermore, we present the important spin–orbit coupling parameters to induce the physical phenomena driven by the magnetic toroidal dipole moment, such as the linear magnetoelectric effect and nonlinear transport.