Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Bio- and Molecular Magnetism

MA 31.1: Vortrag

Freitag, 30. März 2007, 11:00–11:15, H10

Enhanced magnetocaloric effect in frustrated magnetic molecules with icosahedral symmetry — •Jürgen Schnack¹ and Johannes Richter² — ¹Universität Bielefeld, Fakultät für Physik, PF 100131, D-33501 Bielefeld — ²Universität Magdeburg, Institut für Theoretische Physik, PF 4120, D-39016 Magdeburg

Antiferromagnetic finite-size spin systems with icosahedral symmetry constitute very interesting frustrated materials with rather unusual magnetic properties. Among such properties are jumps to the saturation magnetization in the cuboctahedron and the icosidodecahedron as well as metamagnetic phase transitions at zero temperature for instance in the icosahedron and dodecahedron. Some of these properties, for instance the large magnetization jump to saturation, are as well present in the Kagome or other lattice antiferromagnets. In this contribution we investigate the magnetocaloric properties of certain spin clusters with icosahedral symmetry that turn out to be interesting as well. The most striking feature is that the magnetocaloric effect is largely enhanced compared to bipartite antiferromagnets.