Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Bio- and Molecular Magnetism II

MA 21.4: Vortrag

Dienstag, 15. März 2011, 11:45–12:00, HSZ 401

Properties of highly frustrated magnetic molecules studied by the finite-temperature Lanczos method — •Jürgen Schnack and Oliver Wendland — Universität Bielefeld, Universitätsstr. 25, D-33615 Bielefeld

The very interesting magnetic properties of frustrated magnetic molecules are often hardly accessible due to the prohibitive size of the related Hilbert spaces. The finite-temperature Lanczos method is able to treat spin systems for Hilbert space sizes up to about 1 Mrd.. Here we first demonstrate for exactly solvable systems that the method is indeed accurate. Then we discuss the thermal properties of one of the biggest magnetic molecules synthesized to date, the icosidodecahedron with antiferromagnetically coupled spins of s=1/2. We show how genuine quantum features such as the magnetization plateau behave as a function of temperature.