Abstract
The magnetoresistance (MR) in the magnetic fields up to 35 T and the temperature dependencies of the resistance of honeycomb-shape carbon networks were measured in the temperature range 2-300 K. Two transport mechanisms were found in these systems: the hopping conductivity in the strong localization (SL) regime and weak localization (WL) in the diffusive transport limit. A crossover from SL to WL regime was observed with the temperature increasing. The temperature dependence of the resistance follows a typical for 3D-WL law R∼T-n in the temperature range 100-300 and 5-300 K for networks annealed at 950°C and 1150°C, respectively. The negative magnetoresistance (NMR) observed at T>100 and 25 K, depending on the temperature of annealing of the samples, is related to quantum interference in the WL regime. The positive magnetoresistance observed in the low-temperature range was due to the magnetic field induced shrinkage of the electronic wave functions.
| Original language | English |
|---|---|
| Pages (from-to) | 389-390 |
| Number of pages | 2 |
| Journal | Physica E: Low-Dimensional Systems and Nanostructures |
| Volume | 17 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - Apr 2003 |
| Event | Proceedings pf the International Conference on Superlattices - ICSNN 2002 - Touluse, France Duration: Jul 22 2002 → Jul 26 2002 |
Keywords
- Carbon networks
- Hopping transport
- Magnetoresistance
- Self organized systems
- Weak localization
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