Magnetism in graphite oxide: The role of epoxy groups

Details Magnetism in graphite oxide: The role of epoxy groups Magnetism in graphite oxide: The role of epoxy groups

2010-05-31

arxiv.org/abs/1005.5580v2

Physics

Condensed Matter

Strongly Correlated Electrons

This paper has been withdrawn by the author due to an error in dealing with data

Scientific paper

We investigate the magnetism in graphite by controlled oxidation. Our approach renders graphite an insulator while maintaining its structure. Fourier transform infrared spectroscopy and X-ray absorption near edge structure spectra reveal that graphite oxide has epoxy groups on its surface and it is not thermally stable. Magnetic susceptibility data exhibit negative Curie temperature, field irreversibility, and slow relaxation. The magnetic properties diminish after the epoxy groups are destroyed. The overall results indicate the unexpected magnetism is associated with the presence of epoxy groups.

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