Magnetic carbon

Tatiana L. Makarova (), Bertil Sundqvist, Roland Höhne, Pablo Esquinazi, Yakov Kopelevich, Peter Scharff, Valerii A. Davydov, Ludmila S. Kashevarova and Aleksandra V. Rakhmanina
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Tatiana L. Makarova: Ioffe Physico-Technical Institute
Bertil Sundqvist: Umeå University
Roland Höhne: Leipzig University
Pablo Esquinazi: Leipzig University
Yakov Kopelevich: Instituto de Fisica, Unicamp
Peter Scharff: Institute for Physics, TU Ilmenau
Valerii A. Davydov: Institute of High Pressure Physics
Ludmila S. Kashevarova: Institute of High Pressure Physics
Aleksandra V. Rakhmanina: Institute of High Pressure Physics

Nature, 2001, vol. 413, issue 6857, 716-718

Abstract: Abstract The discovery of nanostructured forms of molecular carbon has led to renewed interest in the varied properties of this element. Both graphite and C60 can be electron-doped by alkali metals1 to become superconducting; transition temperatures of up to 52 K have been attained by field-induced hole-doping of C60 (ref. 2). Recent experiments3,4 and theoretical studies5,6 have suggested that electronic instabilities in pure graphite may give rise to superconducting and ferromagnetic properties, even at room temperature. Here we report the serendipitous discovery of strong magnetic signals in rhombohedral C60. Our intention was to search for superconductivity in polymerized C60; however, it appears that our high-pressure, high-temperature polymerization process results in a magnetically ordered state. The material exhibits features typical of ferromagnets: saturation magnetization, large hysteresis and attachment to a magnet at room temperature. The temperature dependences of the saturation and remanent magnetization indicate a Curie temperature near 500 K.

Date: 2001
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DOI: 10.1038/35099527

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