Ferroelectricity driven by symmetric exchange striction in orthorhombic HoMnO$_{3}$

ORAL

Abstract

Orthorhombic HoMnO$_{3}$ crystallizes in a distorted perovskite structure (space group \textit{Pbnm}). It has been predicted that the spin configuration below the N\'eel temperature corresponds to a collinear E-type antiferromagnetic phase, which accompanies a large ferroelectric polarization originated from local oxygen distortions driven by exchange striction. In order to understand the exact nature of the E-type magnetism-driven ferroelectricity as well as the influence of Ho magnetism on ferroelectricity, we have performed comprehensive measurements of physical properties of the system, including magnetic susceptibility, dielectric constant, ferroelectric polarization and heat capacity with the variation of temperature and magnetic fields.

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Authors

  • Nara Lee

    Rutgers Center for Emergent Materials, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • Young Jai Choi

    Rutgers University

  • S.W. Cheong

    Rutgers University, Rutgers Center for Emergent Materials, Rutgers University, USA, Rutgers Univ. Physics Dept., Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA