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• W2062701984 abstract "We find strong evidence for a metal-insulator sMId 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, with rsTd obeying a power-law temperature dependence, rsTd ~ T ˛b . In the insulating regime shigh annealing temperaturesd, the rsTd behavior ranges from Mott-like three-dimensional s3Dd variable-range hopping sVRHd, rsTd ~ expfsT0 / Td ˛1/4 g, to Coulomb-gap sCGVRHd behavior, rsTd ~ expfs˛T0 / Td ˛1/2 g. Concurrently, MRsBd becomes positive for large B, exhibiting a minimum at magnetic field Bmin. The temperature dependence of Bmin can be characterized by BminsTd = Bcs 1˛ T/ Tcd for a large number of samples prepared by different methods. Below a sample-dependent crossover temperature Tc, MRsBd is positive for all B. The observed changes in transport properties are explained by the effect of doping on semiconducting SWNTs and tube-tube coupling." @default.
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• W2062701984 date "2005-04-19" @default.
• W2062701984 modified "2023-09-26" @default.
• W2062701984 title "Metal-insulator transition in doped single-wall carbon nanotubes" @default.
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• W2062701984 doi "https://doi.org/10.1103/physrevb.71.155410" @default.
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