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 Group

Kasper Moth-Poulsen

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Kasper Moth-Poulsen Group

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)

Vol. 8 1 4948

Subject Categories

Ceramics

Fusion, Plasma and Space Physics

Condensed Matter Physics

DOI

10.1038/s41598-018-23254-0

PubMed

29563568

More information

Latest update

5/31/2018