An anisotropic Heisenberg model on the trigonal lattice for multiferroic oxides


An anisotropic Heisenberg model on the trigonal lattice for multiferroic oxides

Kunze, T.; Gemming, S.; Olbrich, C.; Chaplygin, I.; Schmidt, P.; Schreiber, M.

Hexagonal manganites are oxides, in which structural, electronic, and magnetic degrees of freedom are coupled in a complex manner. Therefore, such materials have the potential for novel, nanoscale sensing and switching applications. Manganites are composed of dense-packed hexagonal manganese oxide layers with strong in-plane and weak interlayer coupling, thus the possible spin configurations may be studied with the help of a two-dimensional model Hamiltonian. For this purpose a two-dimensionally periodic trigonal spin system is qualitatively studied with the help of an extended multiparameter Heisenberg model. The temperature dependence of the magnetisation is investigated with the help of a Metropolis-Monte-Carlo algorithm as a function of the anisotropy term and of an external magnetic field. Thermodynamic quantities such as the total energy, the heat capacity and the magnetization are determined by statistical evaluation.

  • Poster
    DPG Frühjahrstagung, 25.-29.02.2008, Berlin, Deutschland

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Publ.-Id: 12167