title: High-pressure synthesis and correlation between structure, magnetic, and dielectric properties in LiNbO(3)-type MnMO3 (M=Ti, Sn).
abstract: LiNbO(3)-type MnMO(3) (M = Ti, Sn) were synthesized under high pressure and temperature; their structures and magnetic, dielectric, and thermal properties were investigated; and their relationships were discussed. Optical second harmonic generation and synchrotron powder X-ray diffraction measurements revealed that both of the compounds possess a polar LiNbO(3)-type structure at room temperature. Weak ferromagnetism due to canted antiferromagnetic interaction was observed at 25 and 50 K for MnTiO(3) and MnSnO(3), respectively. Anomalies in the dielectric permittivity were observed at the weak ferromagnetic transition temperature for both the compounds, indicating the correlation between magnetic and dielectric properties. These results indicate that LiNbO(3)-type compounds with magnetic cations are new candidates for multiferroic materials.
authors.affiliation: Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Tokyo 171-8588, Japan.
authors.forename: Akihisa
authors.initials: A
authors.lastname: Aimi
authors.forename: Tetsuhiro
authors.initials: T
authors.lastname: Katsumata
authors.forename: Daisuke
authors.initials: D
authors.lastname: Mori
authors.forename: Desheng
authors.initials: D
authors.lastname: Fu
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Itoh
authors.forename: Tôru
authors.initials: T
authors.lastname: Kyômen
authors.forename: Ko-ichi
authors.initials: K
authors.lastname: Hiraki
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Takahashi
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Inaguma