Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Bio- and Molecular Magnetism

MA 14.7: Vortrag

Dienstag, 1. April 2014, 11:15–11:30, HSZ 401

Effects of the DM-interaction on thermodynamic properties of a small spin system — •Christian Heesing and Jürgen Schnack — Universität Bielefeld, Bielefeld, Germany

The magnetism of many magnetic molecules is dominated by isotropic Heisenberg exchange interactions. For 3d elements anisotropic contributions are usually small. Nevertheless, they can have drastic consequences at low temperatures as for instance on bistability and quantum tunnelling in the case of easy-axis anisotropies.
In this contribution we investigate the effect of the Dzyaloshinskii-Moriya (DM) interaction [1,2] on thermodynamic magnetic observables such as the low-temperature magnetization. The full Hamiltonian contains Heisenberg exchange, Zeeman term, and Dzyaloshinskii-Moriya interaction. We investigate as an archetypical model system the cuboctahedron. Thermodynamic observables are systematically compared for various ratios of DM and Heisenberg interaction strength.
  [1] T. Moriya, Phys. Rev., 1960, 120, 90-98
  [2] I. Dzyaloshinskii, J. Phys. Chem. Solids, 1958, 4, 241-255