Triggering a Metal-insulator Transition in La0:8 Sr0:2 MnO3 Nanoparticle-decorated Carbon Nanotubes

Kyu Won Lee, Cheol Eui Lee, A. Gedanken, E. Sominski, Yu Koltypin

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6 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)L3309-L3313
JournalJournal of the Korean Physical Society
Volume59
Issue number6
DOIs
StatePublished - 15 Dec 2011

Bibliographical note

Copyright © The Korean Physical Society.

Keywords

  • Kondo effect
  • LSMO nanoparticle-decorated CNTs
  • Metal-insulator transition
  • Superparamagnetism

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