Excess-hole induced high temperature polarized state and its correlation with the multiferroicity in single crystalline DyMnO$_{3}$

ORAL

Abstract

Controlling the ferroelectricity and magnetism in multiferroic materials has been an important research topic. We report the formation of a highly polarized state in multiferroic DyMnO$_{3}$ single crystals which develops well above the magnetic transition temperatures, and we attribute it to the thermally stimulated depolarization current effect of excess holes forming Mn$^{4+}$ ions in the system. We also show that this high temperature polarized state intimately correlates with the lower temperature ferroelectric state that is induced by the incommensurate spiral magnetic order of Mn spins. This study demonstrates an efficient approach to tune the multiferroicity in the manganite system.

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Authors

  • Tao Zou

    Michigan State University

  • Z.L. Dun

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, University of Tennessee, TN, USA

  • Huibo Cao

    Oak Ridge National Laboratory, Oak Ridge National Lab, Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Mengze Zhu

    Michigan State University

  • Daniel Coulter

    Michigan State University

  • H.D. Zhou

    Department of Physics and Astronomy, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA, Univ of Tennessee - Knoxville, U. of Tennessee, University of Tennessee Knoxville, University of Tennessee, TN, USA

  • Xianglin Ke

    Michigan State University