Magnetoconductance in single-wall carbon nanotubes: Electron-electron interaction and weak localization contributions
Abstract
The positive and negative magnetoconductance (MC) data [J. Vavro , Phys. Rev. B 71, 155410 (2005)] in various single-wall carbon nanotube samples are analyzed by taking into account the electron-electron interaction (EEI) contribution, in addition to the weak localization (WL) regime. The low field MC data shows an H2 dependence, in accordance with the EEI and WL models. The contribution from EEI to the total MC is further confirmed from the universal scaling of MC relation [ {Δσ/T1/2} vs (H/T) plots], showing that EEI plays a significant role at higher fields and lower temperatures. Intrinsic parameters such as inelastic scattering length (lin) extracted for barely metallic sample ( 120S/cm at 300K ) follow the T-3/4 dependence due to the inelastic electron-electron scattering in the dirty limit. The lin for highly conducting sample ( 3570S/cm at 300K ) follows a T-0.4 dependence. The various order parameters helps us to characterize the system in a disorder-tuned metal-insulator transition scenario.
- Publication:
-
Physical Review B
- Pub Date:
- December 2007
- DOI:
- 10.1103/PhysRevB.76.235432
- Bibcode:
- 2007PhRvB..76w5432C
- Keywords:
-
- 73.63.Fg;
- 73.22.-f;
- 71.55.Jv;
- Nanotubes;
- Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals;
- Disordered structures;
- amorphous and glassy solids