Identifying the electron spin resonance of conduction electrons in alkali doped SWCNTs

M Galambos, Gabor Fabian, Ferenc Simon, Luka Ciric, László Forro, László Korecz, Antal Rockenbauer, János Koltai, Viktor Zolyomi, Á Rusznyák, Jenö Kürti, Norbert M. Nemes, Balazs Dora, Herwig Peterlik, Rudolf Pfeiffer, Hans Kuzmany, Thomas Pichler

We study the electron spin resonance (ESR) signal of pristine and potassium doped SWCNTs. We identify signals of a superparamagnetic background, a low intensity impurity, and of the conduction electron spin resonance (CESR). The latter only appears upon the alkali atom doping. To identify the CESR signal, we critically assess whether it could come from residual graphitic carbon, which we clearly exclude. We give accurate values for the signal intensities and the corresponding concentration of spins and for the g-factors. The CESR signal intensity allows to determine the density of states on the SWCNT assembly.

Electronic Properties of Materials, Dynamics of Condensed Systems
External organisation(s)
Budapest University of Technology and Economics, École polytechnique fédérale de Lausanne, Hungarian Academy of Sciences, Eötvös Loránd University Budapest, Lancaster University, Universidad Complutense De Madrid, Max-Planck-Institut für Physik komplexer Systeme
No. of pages
Publication date
Austrian Fields of Science 2012
Physics, Astronomy, Solid state physics, Nanotechnology
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