title: High-pressure hydrothermal crystal growth and multiferroic properties of a perovskite YMnO3.
abstract: Orthorhombic perovskites RMnO(3) are representative of spin-driven ferroelectrics. When the radius of the rare-earth ion R is smaller than that of Dy, for instance in YMnO(3), the orthorhombic phase becomes metastable at ambient pressure, which impedes the crystal growth; thus, the detailed magnetic and multiferroic properties of the metastable phase have not been characterized. In this work, we successfully obtained single crystals of orthorhombic YMnO(3) using quasi-hydrothermal conditions under a high pressure of 5.5 GPa. Magnetic and dielectric measurements under magnetic fields revealed that the magnetic ground state is the commensurate E-type antiferromagnetic, while a cycloidal spin phase likely coexists in the intermediate temperature range, which enhances the magnetoelectric response to external fields.
authors.affiliation: Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, Japan. ishiwata@ap.t.u-tokyo.ac.jp
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ishiwata
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tokunaga
authors.forename: Yasujiro
authors.initials: Y
authors.lastname: Taguchi
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura