We have studied the magnetic and the electric properties of La0:8Sr0:2MnO3 (LSMO) nanoparticle-decorated carbon nanotubes (CNTs). The magnetic susceptibility showed a para- magnetic - superparamagnetic phase transition at TSP ~ 200 K with a blocking temperature of TB ~ 120 K, which can be attributed to the LSMO nanoparticles. At TSP, the charge transport taking place through the CNTs network showed a metal-insulator transition (MIT) characteristic of the LSMO nanoparticles, indicating a concomitant MIT in the CNTs triggered by the LSMO nanoparticles. In the metallic phase, the charge transport appears to be dominated by a 2D weak localization effect, which at temperatures below TB was seen to be somewhat suppressed by the internal field. At temperatures below 50 K, a Kondo effect dominates the electric and the magnetic properties.
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- Kondo effect
- LSMO nanoparticle-decorated CNTs
- Metal-insulator transition