Correlation of electric polarization and magnetic ordering in cobalt chloride thiourea

ORAL

Abstract

The coupling between electricity and magnetism in magneto-electric multiferroics has been intensively investigated in a wide range of transition metal oxides. Recently the material classes have been extended to organo-metallic insulators (sometimes known as metal-organic frameworks or molecular magnets) such as NiCl$_{2}$-4[SC(NH$_{2})_{2}$], which provides a new arena for designing magneto-electric multiferroics. We have grown single crystals of cobalt chloride thiourea, CoCl$_{2}$-n[SC(NH$_{2})_{2}$], which forms two different crystal structures with n = 2 and 4. The compound CoCl$_{2}$-2[SC(NH$_{2})_{2}$] has a triclinic crystal structure with strong magnetic anisotropy and $\sim $ 3 $\mu _{B}$/Co ion, indicating \textbf{S} = 3/2 Co spins, and the compound CoCl$_{2}$-4[SC(NH$_{2})_{2}$] has a tetragonal structure with almost no magnetic anisotropy and 1 $\mu _{B}$/Co ion, indicating \textbf{S} = 1/2 Co spins. We will present details of the magnetic field-induced electric polarizations and magnetic properties of these compounds.

–

Authors

  • Eundeok Mun

    • National High Magnetic Field Laboratory (NHMFL), Los Alamos National Lab (LANL), Los Alamos, NM

  • Jason Wilcox

    • Department of Chemistry and Biochemistry Eastern Washington University Cheney, WA 99004 USA

  • Jamie Manson

    • Department of Chemistry and Biochemistry Eastern Washington University Cheney, WA 99004 USA

  • Brian Scott

    • MPA-MC, Los Alamos National Lab (LANL), Los Alamos, NM

  • Paul Tobash

    • MPA-CMMS, Los Alamos National Lab (LANL), Los Alamos, NM

  • Eric Bauer

    • MPA-CMMS, Los Alamos National Lab (LANL), Los Alamos, NM

  • Vivien Zapf

    • MPA-CMMS, Los Alamos National Lab (LANL), Los Alamos, NM