Suppression of the magneto resistance in high electric fields of polyacetylene nanofibers
| Autor: | J. Svensson, Alan B. Kaiser, J.S. Yoo, Sung Ho Jhang, Richard B. Kaner, A. N. Aleshin, Kazuo Akagi, Serguei Brazovskii, Yung Woo Park, S.J. Park, Youngwoo Nam, H.N. Yoo, Ajeong Choi, Hu Sung Kim, Hyo-Pyo Lee, Munju Goh, James S. Brooks, Natasha Kirova, S.H. Lee |
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| Rok vydání: | 2010 |
| Předmět: |
Conductive polymer
Materials science Magnetoresistance Polyaniline nanofibers Condensed matter physics Mechanical Engineering Doping Metals and Alloys Condensed Matter Physics Electronic Optical and Magnetic Materials Polyacetylene chemistry.chemical_compound chemistry Mechanics of Materials Electric field Materials Chemistry Ground state Magneto |
| Zdroj: | Synthetic Metals. 160:1349-1353 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/j.synthmet.2010.04.014 |
| Popis: | We present results of non-linear magneto resistance (MR) of polyacetylene nanofibers in high magnetic field up to H = 30 T at low temperature T = 1.5 K. The MR was proven to be of the spin origin; it reaches 16% at highest H . Unexpectedly, the MR was suppressed by increasing electric field E , vanishing at E ≳ 5 × 10 4 V/cm. It is understood that the doping induced spinless charged soliton pairs, which are initially confined to a certain distance because of the interchain phase correlations, and are deconfined in high electric fields, resulting in a vanishing magneto resistance (VMR). The role of the specific, degenerate ground state of the polyacetylene is confirmed by parallel studies of the different magneto resistances of polyaniline nanofibers which contrarily is not affected by the electric field. |
| Databáze: | OpenAIRE |
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