Effects of Oxygen Deficiencies in CaMn2O4-δ

ORAL

Abstract

Manganese oxides over the last few years have experienced a considerable increase in research interests due to their rich and complex phase diagrams, that are a result of the flexibility of the manganese ions oxidations states. The compounds in the Ca-Mn-O system provide an excellent platform, where theoretically predicted multiferroic behavior could exist. Many manganese oxides have already been thoroughly investigated; however, a potential candidate CaMn2O4 is still not well understood to date.

Polycrystalline CaMn2O4 samples were synthesized and annealed in oxygen and argon flows respectively to further explore the effect of oxygen deficiencies on the physical properties. From temperature dependent dc magnetization and heat capacity measurements, the previously reported antiferromagnetic ordering near 220 K was observed for both samples. However, a spontaneous polarization (PS) was observed near 253 K for only the oxygen annealed sample without applied magnetic field, while no PS was observed for the argon annealed sample. In addition, the dielectric and loss measurements revealed anomalies above 260 K with the time and magnetic field dependent phenomena in both samples. Detailed measurements for both samples are ongoing to gain greater insight into this complex system.

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Presenters

  • Melissa Gooch

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204, Physics, Texas Center for Superconductivity at the University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, The Texas Center for Superconductivity, University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

Authors

  • Melissa Gooch

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204, Physics, Texas Center for Superconductivity at the University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, The Texas Center for Superconductivity, University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Hung-Cheng Wu

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, Texas Center for Superconductivity, University of Houston, Texas 77204, USA, Physics, Texas Center for Superconductivity at the University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston

  • Liangzi Deng

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston TX 77204, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, Texas Center for Superconductivity, University of Houston, Texas 77204, USA, Physics, Texas Center for Superconductivity at the University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, The Texas Center for Superconductivity, University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Hung-Duen Yang

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

  • Paul C. W. Chu

    Texas Center for Superconductivity, University of Houston, Texas 77204, USA, Texas Center for Superconductivity, University of Houston, Physics, Texas Center for Superconductivity at the University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston