Probing variable range hopping lengths by magneto conductance in carbonized polymer nanofibers
Journal article, 2018
Using magneto transport, we probe hopping length scales in the variable range hopping conduction of carbonized polyacetylene and polyaniline nanofibers. In contrast to pristine polyacetylene nanofibers that show vanishing magneto conductance at large electric fields, carbonized polymer nanofibers display a negative magneto conductance that decreases in magnitude but remains finite with respect to the electric field. We show that this behavior of magneto conductance is an indicator of the electric field and temperature dependence of hopping length in the gradual transition from the thermally activated to the activation-less electric field driven variable range hopping transport. This reveals magneto transport as a useful tool to probe hopping lengths in the non-linear hopping regime.
Author
Kyung Ho Kim
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Seoul National University
Samuel Lara Avila
National Physical Laboratory (NPL)
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Hans He
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
H. J. Kang
Seoul National University
S. J. Hong
University of Hanover
Seoul National University
Min Park
KIST Jeonbuk Institute of Advanced Composite Materials
Seoul National University
Johnas Eklöf
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Kasper Moth-Poulsen
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
S. Matsushita
Kyoto University
Kazuo Akagi
Kyoto University
Sergey Kubatkin
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Yung Woo Park
Seoul National University
University of Pennsylvania
Scientific Reports
2045-2322 (ISSN) 20452322 (eISSN)
Vol. 8 1 4948Subject Categories
Ceramics
Fusion, Plasma and Space Physics
Condensed Matter Physics
DOI
10.1038/s41598-018-23254-0
PubMed
29563568