Enhanced magnetocaloric effect in frustrated magnetic molecules with icosahedral symmetry

Details Enhanced magnetocaloric effect in frustrated magnetic molecules with icosahedral symmetry Enhanced magnetocaloric effect in frustrated magnetic molecules with icosahedral symmetry

2007-03-19

arxiv.org/abs/cond-mat/0703480v1

Phys. Rev. B 76 (2007) 054413

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 8 figures, more information at http://obelix.physik.uni-osnabrueck.de/~schnack/

Scientific paper

10.1103/PhysRevB.76.054413

We investigate the magnetocaloric properties of certain antiferromagnetic spin systems that have already been or very likely can be synthesized as magnetic molecules. It turns out that the special geometric frustration which is present in antiferromagnets that consist of corner-sharing triangles leads to an enhanced magnetocaloric effect with high cooling rates in the vicinity of the saturation field. These findings are compared with the behavior of a simple unfrustrated spin ring as well as with the properties of the icosahedron. To our surprise, also for the icosahedron large cooling rates can be achieved but due to a different kind of geometric frustration.

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