Abstract
Abstract 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 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 ∼ 15 K, suggesting the existence of a superconducting state. Magnetization results partially support the existence of both phenomena in the DWCNT bundles.
| Original language | English |
|---|---|
| Article number | 9730 |
| Pages (from-to) | 16-25 |
| Number of pages | 10 |
| Journal | Carbon |
| Volume | 88 |
| DOIs | |
| State | Published - 1 Jul 2015 |
Bibliographical note
Publisher Copyright:© 2015 Elsevier Ltd. All rights reserved.
Funding
The work in Israel was partially supported by the Israel National Research Center for Electrochemical Propulsion (INREP; I-CORE Program of the Planning and Budgeting Committee and The Israel Science Foundation 2797/11). Fruitful discussions with Prof. Y. Yeshurun from Bar Ilan University are gratefully acknowledged.
| Funders | Funder number |
|---|---|
| Israel Science Foundation | 2797/11 |
| Israel National Research Center for Electrochemical Propulsion |