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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.5: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

DMRG studies of magnetic molecules — •Joerg Ummethum and Juergen Schnack — Universität Bielefeld, Fakultät für Physik, Postfach 100131, D-33501 Bielefeld

The DMRG technique provides a powerful tool for the investigation of ground state and dynamical properties of low-dimensional strongly correlated quantum systems [1]. The results are most accurate for one-dimensional systems with nearest neighbour interactions but an application to rather complex magnetic molecules described by the Heisenberg model is also possible [2].

We present new results of our DMRG studies of the antiferromagnetic Heisenberg icosidodecahedron for different spin quantum numbers. Special emphasis is laid on the lowest energy levels in the subspaces of total magnetic quantum number which possess a so-called rotational band structure for many systems [3].

[1] S. R. White, Phys. Rev. B 48, 10345 (1993); U. Schollwöck, Rev. Mod. Phys. 77, 259 (2005);

[2] M. Exler and J. Schnack, Phys. Rev. B 67, 094440 (2003);

[3] J. Schnack and M. Luban, Phys. Rev. B 63, 014418 (2000).