NDLI: Metal-insulator transition in doped single-wall carbon nanotubes

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Metal-insulator transition in doped single-wall carbon nanotubes

Content Provider	Semantic Scholar
Author	Vavro, Juraj Kikkawa, James M. Fischer, J. E.
Copyright Year	2005
Abstract	We find strong evidence for a metal-insulator sMI d transition in macroscopic single wall carbon nanotube sSWNTd conductors. This is revealed by systematic measurements of resistivity and transverse magnetoresistance sMRd in the ranges 1.9–300 K and 0–9 Tesla, as a function of p-type redox doping. Strongly H2SO4-doped samples exhibit small negative MR, and the resistivity is low and only weakly temperaturedependent. Stepwise dedoping by annealing in vacuum induces a MI transition. Critical behavior is observed near the transition, withrsTd obeying a power-law temperature dependence, rsTd~T−b. In the insulating regime shigh annealing temperatures d, the rsTd behavior ranges from Mott-like three-dimensional s3Dd variable-range hoppingsVRHd, rsTd~expfsT0/Tdg, to Coulomb-gap sCGVRHd behavior, rsTd ~expfs−T0/Tdg. Concurrently, MRsBd becomes positive for large B, exhibiting a minimum at magnetic field Bmin. The temperature dependence of Bmin can be characterized by BminsTd=Bcs1−T/Tcd for a large number of samples prepared by different methods. Below a sample-dependent crossover temperature Tc, MRsBd is positive for allB. The observed changes in transport properties are explained by the effect of doping on semiconducting SWNTs and tube-tube coupling.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://repository.upenn.edu/cgi/viewcontent.cgi?article=1063&context=mse_papers
Alternate Webpage(s)	http://www.seas.upenn.edu/~jefnano/pdf/PRB71_155410.pdf
Language	English
Access Restriction	Open
Subject Keyword	Doping (semiconductor) Doping in Sports Exhibits as Topic Magnetic Fields Metal (API) Nanotubes Nanotubes, Carbon Obedience (human behavior) Semiconductor Simulated annealing Technetium Tesla (microarchitecture) Tesla - unit Top-down and bottom-up design Topological insulator Transverse wave
Content Type	Text
Resource Type	Article

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