Inversion symmetry controlled multiferroic response in an Ising Chain Magnet

ORAL

Abstract

Recently, Choi et al. [1] discovered that ferroelectricity in the Ising chain magnet results from inversion symmetry breaking due to the formation of an alternating ionic order of two different ions leading to an up-up-down-down spin configuration. Here we report the observation of drastic changes in the multiferroic character as a function of magnetic field in the Ising chain magnet. Application of a magnetic field up to 33 T, leads to two abrupt changes in the dielectric constant, respectively at $H_1$ = 5 T and at $H_2$=20T, with the first one leading to a fast suppression of the dielectric polarization. The saturation values of the magnetic moment observed by using a vibrating sample magnetometer and a cantilever beam magnetometer suggest that the one ionic moments align along the field for fields above 5 T followed by the subsequent alignment of the other ionic moments above 20 T. [1] Y.J. Choi $et al.$ Physical Review Lett. submitted

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Authors

  • Younjung Jo

    National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32310, NHMFL, National High Magnetic Field Laboratory

  • Seongsu Lee

    Rutgers University, USA

  • HeeTaek Yi

  • S.-W. Cheong

    Rutgers University, RCEM and Rutgers University, Piscataway, NJ, Rutgers University (Deparment of Physics), Rutgers Univ., Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854

  • Luis Balicas

    National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32310, NHMFL-Tallahassee, NHMFL, National High Magnetic Field Laboratory