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MA: Fachverband Magnetismus

MA 27: Bio- and Molecular Magnetism

MA 27.12: Talk

Thursday, February 28, 2008, 17:15–17:30, EB 202

Approximate spectra for magnetic molecules with sublattice structure — •Roman Schnalle¹ and Jürgen Schnack² — ¹Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück — ²Universität Bielefeld, Fakultät für Physik, PF 100131, D-33501 Bielefeld

A lot of interesting magnetic molecules cannot be treated with numerically exact diagonalization routines because of the huge dimensions of the Hilbert spaces. Therefore approximate numerical techniques are highly desirable to obtain information about the energy spectra of the investigated systems. In a recent work we developed a perturbation theory that is guided by an approximate Hamiltonian for spin systems with sublattice structure, the rotational band Hamiltonian [1]. Within this perturbative approach an increasing number of states is taken into account. These states are chosen to be those with low-lying energies in the spectrum of the rotational band Hamiltonian [2].
[1] J. Schnack, M. Luban, Phys. Rev. B 63, 014418 (2000)
[2] O. Waldmann, Phys. Rev. B 75, 012415 (2007)