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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 Westerström^1,2, Jan Dreiser², Cinthia Piamonteze², Roland Stania^1,2, Fumihiko Matsui^1,3, Stephen Weyeneth¹, Veacheslav Vieru⁴, Liviu Ungur⁴, Liviu Chibotaru⁴, Stefano Rusponi⁵, Harald Brune⁵, Shangfeng Yang^6,7, 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).