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MA: Magnetismus

MA 23: Bio-und molekularer Magnetismus

MA 23.11: Vortrag

Donnerstag, 27. März 2003, 12:45–13:00, HSZ/401

Ferromagnetic Carbon with Enhanced Curie Temperature — •Vladimir Narozhnyi^1,2, Karl-Hartmut Müller¹, Manfred Wolf¹, Dieter Eckert¹, Angelika Teresiak¹, Lothar Dunsch¹, Valerii Davydov², Ludmila Kashevarova², and Alexandra Rakhmanina² — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, PO Box 270116, D-01171 Dresden, Germany — ²Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow Region, 142190, Russia

The discovery of a ferromagnetic form of carbon [T.L. Makarova et al., Nature 413 (2001) 716] gives a new perspective in the investigation of magnetic materials. The existence of a ferromagnetic state with the very high Curie temperature T_C ≈ 500 K for a material with only s- and p-electrons as well as the nature of its underlying interaction are of great fundamental interest. Here we report on the observation of the ferromagnetically ordered state in a material obtained by high-pressure high-temperature treatment of the fullerene C₆₀. It has a saturation magnetization more than four times larger than that reported previously. From our data we estimated the considerably higher value of T_C ≈ 820 K.