title: Novel multiferroic state of Eu1-xYxMnO3 in high magnetic fields.
abstract: Magnetic and dielectric properties of Eu1-xYxMnO3 (x=0 and 0.4) are studied in pulsed magnetic fields up to 55 T. For x=0, application of magnetic fields higher than 20 T along the b axis causes magnetic transitions accompanied by generation of electric polarization (P) along the a axis. Similar first-order transitions are also observed in crystals of x=0.4, in which the ground state at zero magnetic field is already a ferroelectric P parallel a phase of different origin. Realistic model calculation indicates the presence of a novel multiferroic state induced by the spin exchange striction mechanism in high magnetic fields as an essential nature of the frustrated Mn spin system in this class of manganites.
authors.affiliation: The Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba 277-8581, Japan. tokunaga@issp.t.u-tokyo.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Tokunaga
authors.forename: Y
authors.initials: Y
authors.lastname: Yamasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Onose
authors.forename: M
authors.initials: M
authors.lastname: Mochizuki
authors.forename: N
authors.initials: N
authors.lastname: Furukawa
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura