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Electron spin resonance in alkali doped SWCNTs
Author(s) -
Simon F.,
Galambos M.,
Quintavalle D.,
Náfrádi B.,
Forró L.,
Koltai J.,
Zólyomi V.,
Kürti J.,
Nemes N. M.,
Rümmeli M. H.,
Kuzmany H.,
Pichler T.
Publication year - 2008
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.200879645
Subject(s) - alkali metal , electron paramagnetic resonance , doping , impurity , electron , spin (aerodynamics) , conductivity , materials science , microwave , resonance (particle physics) , condensed matter physics , chemistry , analytical chemistry (journal) , atomic physics , nuclear magnetic resonance , physics , quantum mechanics , organic chemistry , chromatography , thermodynamics
Electron spin resonance (ESR) measurements on SWCNTs doped with alkali atoms (potassium) using a solid state reaction is reported. We find the emergence of the ESR signal of itinerant electrons upon doping with a signal intensity that is comparable to that expected from band structure calculations. The ESR line‐width and microwave conductivity weakly depend on the temperature indicating that doped SWCNTs are bad metals. It is argued to result from the lack of crystalline order in the tubes and the large impurity concentration. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)