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Identifying the electron spin resonance of conduction electrons in alkali doped SWCNTs
Author(s) -
Galambos M.,
Fábián G.,
Simon F.,
Ćirić L.,
Forró L.,
Korecz L.,
Rockenbauer A.,
Koltai J.,
Zólyomi V.,
Rusznyák Á.,
Kürti J.,
Nemes N. M.,
Dóra B.,
Peterlik H.,
Pfeiffer R.,
Kuzmany H.,
Pichler T.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200982330
Subject(s) - electron paramagnetic resonance , electron , doping , spins , spin (aerodynamics) , alkali metal , materials science , impurity , conduction electron , signal (programming language) , resonance (particle physics) , atomic physics , thermal conduction , nuclear magnetic resonance , condensed matter physics , spin polarization , physics , nuclear physics , quantum mechanics , computer science , composite material , thermodynamics , programming language
We study the electron spin resonance (ESR) signal of pristine and potassium doped SWCNTs. We identify signals of a super‐paramagnetic 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.