Eur. Phys. J. B 55, 57-62 (2007)
https://doi.org/10.1140/epjb/e2007-00041-7

Structural and magnetic properties of polymerized C₆₀ with Fe

¹ Department of Physics, Umeå University, 90187 Umeå, Sweden
² Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
³ Division of Superconductivity and Magnetism, University of Leipzig, 04103 Leipzig, Germany

Corresponding author: ^a esquin@physik.uni-leipzig.de

Received: 29 November 2006
Revised: 16 January 2007
Published online: 9 February 2007

Abstract

We provide evidence that high-pressure high-temperature (2.5 GPa and 1040 K) treatment of mixtures of iron with fullerene powders leads to the complete transformation of iron into iron carbide Fe₃C. The comparison of the magnetic properties (Curie temperature and magnetic moment) of the here studied samples and those for the ferromagnetic polymer Rh-C₆₀ indicates that the main ferromagnetic signal reported in those samples is due to Fe₃C and not related to the ferromagnetism of carbon as originally interpreted. Taking into account the results obtained in this study the original paper on “Magnetic carbon" [Nature 413, 716 (2001)] was recently retracted.