Abstract
We have fabricated nanocomposites consisting of 4-Å carbon nanotubes embedded in the 0.7-nm pores of aluminophosphate-five (AFI) zeolite that display a superconducting specific heat transition at 15 K. MicroRaman spectra of the samples show strong and spatially uniform radial breathing mode (RBM) signals at 510 cm −1 and 550 cm −1 , characteristic of the (4, 2) and (5, 0) nanotubes, respectively. The specific heat transition is suppressed at >2 T, with a temperature dependence characteristic of finite-size effects. Comparison with theory shows the behavior to be consistent with that of a type II BCS superconductor, characterized by a coherence length of 14 ± 2 nm and a magnetic penetration length of 1.5 ± 0.7 μm. Four probe and differential resistance measurements have also indicated a superconducting transition initiating at 15 K, but the magnetoresistance data indicate the superconducting network to be inhomogeneous, with a component being susceptible to magnetic fields below 3 T and other parts capable of withstanding a magnetic field of 5 T or beyond.
Bibliography
Lortz, R., Zhang, Q., Shi, W., Ye, J. T., Qiu, C., Wang, Z., He, H., Sheng, P., Qian, T., Tang, Z., Wang, N., Zhang, X., Wang, J., & Chan, C. T. (2009). Superconducting characteristics of 4-â« carbon nanotubeâzeolite composite. Proceedings of the National Academy of Sciences, 106(18), 7299â7303.
Authors
14
- Rolf Lortz (first)
- Qiucen Zhang (additional)
- Wu Shi (additional)
- Jian Ting Ye (additional)
- Chunyin Qiu (additional)
- Zhe Wang (additional)
- Hongtao He (additional)
- Ping Sheng (additional)
- Tiezheng Qian (additional)
- Zikang Tang (additional)
- Ning Wang (additional)
- Xixiang Zhang (additional)
- Jiannong Wang (additional)
- Che Ting Chan (additional)
References
27
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Dates
Type | When |
---|---|
Created | 16 years, 4 months ago (April 15, 2009, 9:53 p.m.) |
Deposited | 3 years, 4 months ago (April 12, 2022, 5:16 p.m.) |
Indexed | 1 year, 7 months ago (Jan. 25, 2024, 12:05 p.m.) |
Issued | 16 years, 3 months ago (May 5, 2009) |
Published | 16 years, 3 months ago (May 5, 2009) |
Published Online | 16 years, 3 months ago (May 5, 2009) |
Published Print | 16 years, 3 months ago (May 5, 2009) |
@article{Lortz_2009, title={Superconducting characteristics of 4-Å carbon nanotube–zeolite composite}, volume={106}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.0813162106}, DOI={10.1073/pnas.0813162106}, number={18}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Lortz, Rolf and Zhang, Qiucen and Shi, Wu and Ye, Jian Ting and Qiu, Chunyin and Wang, Zhe and He, Hongtao and Sheng, Ping and Qian, Tiezheng and Tang, Zikang and Wang, Ning and Zhang, Xixiang and Wang, Jiannong and Chan, Che Ting}, year={2009}, month=may, pages={7299–7303} }