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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A method has been developed for the determination of berberine as a quinolizinium medicine. The method is based on the solvent extraction-titration of an ion pair. Sodium tetraphenylborate is used as the titrant, with tetrabromophenolphthalein ethyl ester as the indicator in the presence of chloroform. In the two-phase titration, the proposed procedure gives sharp end points as the organic phase changes from blue to yellow. The aqueous phase is colorless throughout the titration. From a p(berberine)-pH diagram, a theoretical titration curve is constructed. The titration curve at pH 6.5 is not too far from the ideal case.
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