Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Molecular Magnetism
MA 40.4: Vortrag
Donnerstag, 14. März 2013, 15:45–16:00, H23
The role of dysprosium in single-molecule magnets based on mixed metal nitride cluster fullerenes — •Rasmus Westerström1,2, Jan Dreiser2, Cinthia Piamonteze2, Roland Stania1,2, Fumihiko Matsui1,3, Stephen Weyeneth1, Veacheslav Vieru4, Liviu Ungur4, Liviu Chibotaru4, Stefano Rusponi5, Harald Brune5, Shangfeng Yang6,7, Alexey Popov6, Matthias Muntwiler2, Lothar Dunsch6, and Thomas Greber1 — 1Physik-Institut, Universität Zürich, Switzerland — 2Swiss Light Source, Paul Scherrer Institut, Switzerland — 3NAIST Ikoma, Nara, Japan — 4Division of Quantum and Physical Chemistry, Katholieke Universiteit Leuven, Belgium — 5Institute of Condensed Matter Physics, EPFL, Lausanne, Switzerland — 6Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science and Engineering, USTC, China — 7Department of Electrochemistry and Conducting Polymers, Leibniz Institute of Solid State and Materials Research, Dresden, Germany
So far it was known that the metal nitride cluster fullerenes Ln3N@C80 (Ln = Tb, Ho) are paramagnetic above 1.8 K [1]. Here we report on the first fullerene exhibiting single-molecule magnet behaviour [2]. The magnetism of DySc2N@C80 was studied using x-ray magnetic circular dichroism (XMCD), SQUID, and ab initio calculations. SQUID show hysteresis and thermal and nonthermal spin relaxation. In a next step endofullerenes containing more than one Dy ion were investigated.
[1] M. Wolf et al, Angew. Chem. Int. Ed. 44, 3306 (2005).
[2] R. Westerström et al, J.Am. Chem. Soc. 134, 9840 (2012).