$π$-Electron Ferromagnetism in Metal Free Carbon Probed by Soft X-Ray Dichroism

Details $π$-Electron Ferromagnetism in Metal Free Carbon Probed by Soft X-Ray Dichroism $π$-Electron Ferromagnetism in Metal Free Carbon Probed by Soft X-Ray Dichroism

2006-09-19

arxiv.org/abs/cond-mat/0609478v3

Physics

Condensed Matter

Other Condensed Matter

10 pages 3 color figures

Scientific paper

10.1103/PhysRevLett.98.187204

Elemental carbon represents a fundamental building block of matter and the possibility of ferromagnetic order in carbon attracted widespread attention. However, the origin of magnetic order in such a light element is only poorly understood and has puzzled researchers. We present a spectromicroscopy study at room temperature of proton irradiated metal free carbon using the elemental and chemical specificity of x-ray magnetic circular dichroism (XMCD). We demonstrate that the magnetic order in the investigated system originates only from the carbon $\pi$-electron system.

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