Magnetoelectric Effect in the Antiferromagnetic Ordered State of Ce${}_3$TiBi${}_5$ with Ce Zig-Zag Chains

Abstract

In this study, we investigate the magnetoelectric (ME) effect of the newly discovered antiferromagnetic (AFM) compound Ce${}_3$TiBi${}_5$ with a hexagonal structure (space group $P{6}_3$/$mcm$). In this system, Ce ions form zig-zag chains that extend along the $c$-axis. We focus on the lack of the local inversion symmetry at the Ce site, although the crystal structure has an inversion center. A theoretical study has predicted that magnetization can be induced by an electric current in the AFM ordering on the zig-zag chain. We conducted magnetization measurements on Ce${}_3$TiBi${}_5$ under an applied constant electric current and a static magnetic field around the AFM ordering temperature of $T_{\mathrm{N}}$ = 5.0 K. We successfully observed of the current-induced magnetization below $T_{\mathrm{N}}$. The magnitude of the current-induced magnetization has a linear electric current dependence and exhibits no magnetic field dependence. This behavior is consistent with the theoretical prediction of the ME effect in the ferrotoroidal ordered state.

11 pages, 5 figures

References in corpus (4)

• Current induced electron spin polarization in strained semiconductors
• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• Toroidal order in metals without local inversion symmetry
• Optical Selection Rules in Spin-Orbit Coupled Systems on Honeycomb Lattice