Antiferroelectric antiferromagnetic type-I multiferroic Cu<sub>9</sub>O<sub>2</sub>(SeO<sub>3</sub>)<sub>4</sub>Cl<sub>6</sub>

POSTER

Abstract

We report that Cu9O2(SeO3)4Cl6 is a new multiferroic compound. Comprehensive studies of this compound have been carried out on single crystals as well as polycrystalline samples. Magnetic susceptibility c and specific heat C with H || c–axis both reveal an anomaly at TN = 37 K associated with the long-range antiferromagnetic order. However, no signature of this phase transition is seen with the H || b-axis, providing evidence of the anisotropic nature of its magnetic properties. The results of c measurements are consistent with the temperature evolution of the intensity of magnetic reflections from the neutron diffraction experiments. The magnetic structure derived from neutron scattering measurements shows that half of the Cu(5) ions carrying no moments. Furthermore, an anomaly in the dielectric constant near TN and observable magnetoelectric coupling below TN are found. At high temperatures, a dielectric peak at TE = 267 K is identified with no measurable spontaneous polarization below TE, thereby suggesting an antiferroelectric order. A step-like anomaly seen in c(T) at TE hints at weak spin-lattice coupling. Concomitantly, high-resolution temperature-dependent synchrotron x-ray diffraction experiments elucidate a local structural distortion at TE.

*MOST:106-2112-M-110 -013 -MY3

Presenters

  • Ting-Wei Kuo

    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan

Authors

  • Ting-Wei Kuo

    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan

  • Hung-Cheng Wu

    • Physics, National Sun Yat-sen University
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Zong-Heng Yang

    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan

  • D. Chandrasekhar Kakarla

    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ

  • Kseniia Denisova

    • Physics Faculty, Lomonosov Moscow State University, Moscow 119991, Russia

  • O.V. Maximova

    • Physics Faculty, Lomonosov Moscow State University, Moscow 119991, Russia

  • Chi-Hung Lee

    • Department of Physics, National Central University, Chung-Li 30001, Taiwan

  • Wen-Hsien Li

    • Department of Physics, National Central University, Chung-Li 30001, Taiwan

  • helmuth berger

    • EPFL
    • Ecole Polytechnique Federale de Lausanne
    • Inst Condensed Matter & Complex Syst, Ecole Polytech Fed Lausanne, Lausanne CH-1015, Switzerland
    • Institut de Physique de la Matiere Complexe, Ecole Polytechnique Federale de Lausanne
    • Institute of Physics of Complex Matter, Switzerland

  • Chin-Wei Wang

    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

  • Chung-Kai Chang

    • National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
    • National Synchrotron Radiation Research Center, Taiwan
    • National Synchrotron Radiation Research Center
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

  • Yu-Chun Chuang

    • National Synchrotron Radiation Research Center
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

  • Jiunn-Yuan Lin

    • Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan

  • Melissa Gooch

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas

  • Ching (Paul) W Chu

    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas, 77204, USA
    • Texas Center for Superconductivity, University of Houston, Texas
    • Texas Center for Superconductivity, University of Houston
    • Univ of Houston

  • Hung-Duen Yang

    • Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Department of Physics, National Sun Yat-sen University, Taiwan

  • A. N. Vasiliev

    • Physics Faculty, Lomonosov Moscow State University, Moscow 119991, Russia