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 P6 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 N = 5.0 K. We successfully observed of the current-induced magnetization below T 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.Magnetoelectric (ME) effect has attracted considerable attention in not only some dielectric materials but also some metallic compounds. The ME effect has been discovered in chromium oxide as electric-field-induced magnetization. 1-3) In multiferroic materials, large ME responses have been extensively studied, where electric polarization was induced by magnetic field. 4-7) On the other hand, some theoretical studies pointed out that a spontaneous toroidal order can be realized in a metallic compound by specific magnetic ordering on the * motoyama@riko.shimane-u.ac.jp 1/11 J. Phys. Soc. Jpn.
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We have performed DC magnetization measurements under applying electric current and zero magnetic field on Ce3TiBi5, in which current-induced magnetization was observed at finite magnetic field in our previous study. In the present work, we have succeeded to observe currentinduced magnetization under zero magnetic field, clearly indicating that the magnetization is induced by an electric current not by a magnetic field. In addition, we have made an attempt to observe current-induced magnetization in a reference compound La3TiBi5 by using the same measurement system. Based on the fact that no magnetoelectric response is observed in La3TiBi5, we have suggested that the observed magnetoelectric response on Ce3TiBi5 is an intrinsic behavior.
We have succeeded in growing single crystals of Ce 3 ZrBi 5 with hexagonal structure of P6 3 /mcm by the Bi self-flux method. Ce 3 ZrBi 5 is a newly discovered Ce compound with Ce zigzag chains, and the Ce site lacks local inversion symmetry. Measurements of electrical resistivity and magnetic susceptibility have been carried out on Ce 3 ZrBi 5 at applying magnetic field. These results indicate that Ce 3 ZrBi 5 is the antiferromagnetic compound with T N = 4.9 K. Magnetic phase diagram was constructed up to 8 T. With applied magnetic field parallel to the c-axis, a successive magnetic transition is observed in both results of electrical resistivity and magnetic susceptibility. Ce 3 ZrBi 5 has a complex magnetic phase diagram in magnetic field.
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