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Title: Extreme Magneto-transport of Bulk Carbon Nanotubes in Sorted Electronic Concentrations and Aligned High Performance Fiber

We explored high-field (60 T) magneto-resistance (MR) with two carbon nanotube (CNT) material classes: (1) unaligned single-wall CNTs (SWCNT) films with controlled metallic SWCNT concentrations and doping degree and (2) CNT fiber with aligned, long-length microstructure. All unaligned SWCNT films showed localized hopping transport where high-field MR saturation definitively supports spin polarization instead of a more prevalent wave function shrinking mechanism. Nitric acid exposure induced an insulator to metal transition and reduced the positive MR component. Aligned CNT fiber, already on the metal side of the insulator to metal transition, had positive MR without saturation and was assigned to classical MR involving electronic mobility. Subtracting high-field fits from the aligned fiber’s MR yielded an unconfounded negative MR, which was assigned to weak localization. It is concluded that fluctuation induced tunnelling, an extrinsic transport model accounting for most of the aligned fiber’s room temperature resistance, appears to lack MR field dependence.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. Univ. of Cambridge (United Kingdom)
  2. Univ. of Cambridge (United Kingdom); Warsaw Univ. of Technology (Poland)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
  4. Cranfield Univ., Bedfordshire (United Kingdom)
Publication Date:
Report Number(s):
LA-UR-17-30075
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High Magnetic Field Science
OSTI Identifier:
1412911

Bulmer, John S., Lekawa-Raus, Agnieszka, Rickel, Dwight G., Balakirev, Fedor F., and Koziol, Krzysztof K.. Extreme Magneto-transport of Bulk Carbon Nanotubes in Sorted Electronic Concentrations and Aligned High Performance Fiber. United States: N. p., Web. doi:10.1038/s41598-017-12546-6.
Bulmer, John S., Lekawa-Raus, Agnieszka, Rickel, Dwight G., Balakirev, Fedor F., & Koziol, Krzysztof K.. Extreme Magneto-transport of Bulk Carbon Nanotubes in Sorted Electronic Concentrations and Aligned High Performance Fiber. United States. doi:10.1038/s41598-017-12546-6.
Bulmer, John S., Lekawa-Raus, Agnieszka, Rickel, Dwight G., Balakirev, Fedor F., and Koziol, Krzysztof K.. 2017. "Extreme Magneto-transport of Bulk Carbon Nanotubes in Sorted Electronic Concentrations and Aligned High Performance Fiber". United States. doi:10.1038/s41598-017-12546-6. https://www.osti.gov/servlets/purl/1412911.
@article{osti_1412911,
title = {Extreme Magneto-transport of Bulk Carbon Nanotubes in Sorted Electronic Concentrations and Aligned High Performance Fiber},
author = {Bulmer, John S. and Lekawa-Raus, Agnieszka and Rickel, Dwight G. and Balakirev, Fedor F. and Koziol, Krzysztof K.},
abstractNote = {We explored high-field (60 T) magneto-resistance (MR) with two carbon nanotube (CNT) material classes: (1) unaligned single-wall CNTs (SWCNT) films with controlled metallic SWCNT concentrations and doping degree and (2) CNT fiber with aligned, long-length microstructure. All unaligned SWCNT films showed localized hopping transport where high-field MR saturation definitively supports spin polarization instead of a more prevalent wave function shrinking mechanism. Nitric acid exposure induced an insulator to metal transition and reduced the positive MR component. Aligned CNT fiber, already on the metal side of the insulator to metal transition, had positive MR without saturation and was assigned to classical MR involving electronic mobility. Subtracting high-field fits from the aligned fiber’s MR yielded an unconfounded negative MR, which was assigned to weak localization. It is concluded that fluctuation induced tunnelling, an extrinsic transport model accounting for most of the aligned fiber’s room temperature resistance, appears to lack MR field dependence.},
doi = {10.1038/s41598-017-12546-6},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {9}
}

Works referenced in this record:

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Metal-insulator transition in doped single-wall carbon nanotubes
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High-Field Electrical Transport in Single-Wall Carbon Nanotubes
journal, March 2000