Magnetic order and superconductivity observed in bundles of Double-Wall Carbon Nanotubes
| Autor: | Barzola-Quiquia, J., Esquinazi, P., Lindel, M., Spemann, D., Muallem, M., Nessim, G. D. |
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| Rok vydání: | 2015 |
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| Druh dokumentu: | Working Paper |
| Popis: | The magnetotransport properties were studied in hundreds of micrometer length double-wall carbon nanotubes (DWCNT) bundles. Above 15 K the resistance shows an ohmic behavior and its temperature dependence is well described using the variable-range hopping for one-dimensional system. The magnetoresistance is negative and can be explained using an empirical model based on spin-scattering processes indicating the existence of magnetic order up to room temperature. At temperatures between 2 K and 15 K the resistance is non-ohmic and the current-voltage characteristics reveal the appearance of a potential, which can be well described by a fluctuation-induced tunneling conduction model. In this low temperature range and at low enough input current, a positive magnetoresistance appears - in addition to the negative one - with an extraordinary hysteresis in field and vanishes at $T \sim 15 $K, suggesting the existence of a superconducting state. Magnetization results partially support the existence of both phenomena in the DWCNT bundles. Comment: 12 pages, 13 figures, to be published in Carbon (2015) |
| Databáze: | arXiv |
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