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

doi:10.3938/jkps.59.3309

Triggering a Metal-insulator Transition in La_0:8 Sr_0:2 MnO₃ Nanoparticle-decorated Carbon Nanotubes

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

Research output: Contribution to journal › Letter › peer-review

6 Citations (Scopus)

Abstract

We have studied the magnetic and the electric properties of La_0:8Sr_0:2MnO₃ (LSMO) nanoparticle-decorated carbon nanotubes (CNTs). The magnetic susceptibility showed a para- magnetic - superparamagnetic phase transition at T_SP ~ 200 K with a blocking temperature of T_B ~ 120 K, which can be attributed to the LSMO nanoparticles. At T_SP, 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 T_B 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 language	English
Pages (from-to)	L3309-L3313
Journal	Journal of the Korean Physical Society
Volume	59
Issue number	6
DOIs	https://doi.org/10.3938/jkps.59.3309
Publication status	Published - 2011 Dec 15

Keywords

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

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.3938/jkps.59.3309

Cite this

@article{b9234f0f75b34db9aa119acbe1e97e7f,

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

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 \textasciitilde{} 200 K with a blocking temperature of TB \textasciitilde{} 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.",

keywords = "Kondo effect, LSMO nanoparticle-decorated CNTs, Metal-insulator transition, Superparamagnetism",

author = "Lee, \{Kyu Won\} and Lee, \{Cheol Eui\} and A. Gedanken and E. Sominski and Yu Koltypin",

year = "2011",

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language = "English",

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journal = "Journal of the Korean Physical Society",

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TY - JOUR

T1 - Triggering a Metal-insulator Transition in La0:8 Sr0:2 MnO3 Nanoparticle-decorated Carbon Nanotubes

AU - Lee, Kyu Won

AU - Lee, Cheol Eui

AU - Gedanken, A.

AU - Sominski, E.

AU - Koltypin, Yu

PY - 2011/12/15

Y1 - 2011/12/15

N2 - 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.

AB - 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.

KW - Kondo effect

KW - LSMO nanoparticle-decorated CNTs

KW - Metal-insulator transition

KW - Superparamagnetism

UR - https://www.scopus.com/pages/publications/83455195354

U2 - 10.3938/jkps.59.3309

DO - 10.3938/jkps.59.3309

M3 - Letter

AN - SCOPUS:83455195354

SN - 0374-4884

VL - 59

SP - L3309-L3313

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

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