Crystal structure of a non-centrosymmetric system, CuY2Ge2O8

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International Conference on Neutron Scattering
A non-centrosymmeric material doesn’t have an inversion symmetry, which could lead to the intrinsic electric polarization. When this system consists of magnetic ions, the electric polarization of the system can be modified by a so-called magnetoelectric coupling under magnetic field. This multiferroic property has been widely studied not only for physical interest but also for industrial application. We synthesized both single crystal and polycrystalline samples of new multiferroic systems, Cu(Y,La) Ge and determined the crystal structure at 300 and 450 K using high-resolution powder and single crystal diffraction studies. According to our studies, both samples having magnetic Cu2+ ions has a monoclinic unit cell (space group I 1 1) without inversion symmetry. We also determined the high temperature structure that has a more symmetric orthorhombic unit cell (I m m 2). Using the structural information, we could calculate the theoretical electric polarization at room temperature phase and found that it reaches the electric polarization of 9.88 μC/cm2 along the a-axis.
Polarization, Magnetic fields, Crystal structure, Monocrystals, Polycrystals, Diffraction
Cho, H., Sim, H., Lee, S., Avdeev, M., Noda, Y., & Park, J.-G. (2017). Crystal structure of a non-centrosymmetric system, CuY2Ge2O8. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from: