Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.79: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Study of magnetocaloric properties of Gd4Mn8 molecules using the finite-temperature Lanczos method — •Christian Heesing and Jürgen Schnack — Universität Bielefeld, Universitätsstr. 25, D-33615 Bielefeld
The magnetocaloric effect can be used to cool or heat a system by varying the external magnetic field. To optimize this effect one needs magnetic molecules with big entropy changes when sweeping the field isothermally. Those big entropy changes can be found in molecules with a high density of low-lying high spin multiplets. In this contribution we discuss molecules of the Gd4Mn8 class [1] that have been studied by the finite-temperature Lanczos method [2] in the Heisenberg-model. This method generates very accurate approximations of thermal observables for Hilbert space dimensions of up to 1010.
[1] T. N. Hooper et al., Angew. Chem. Int. Ed. 51, 4633 (2012)
[2] J. Schnack, O. Wendland, Eur. Phys. J. B 78 (2010) 535-541