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| Content Provider | PubMed Central |
|---|---|
| Author | Lortz, Rolf Zhang, Qiucen Shi, Wu Ye, Jian Ting Qiu, Chunyin Wang, Zhe He, Hongtao Sheng, Ping Qian, Tiezheng Tang, Zikang Wang, Ning Zhang, Xixiang Wang, Jiannong Chan, Che Ting |
| 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. |
| Related Links | http://dx.doi.org/10.1073/pnas.0813162106 |
| Ending Page | 7303 |
| Page Count | 5 |
| Starting Page | 7299 |
| File Format | |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 106 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2009-05-05 |
| Access Restriction | Open |
| Rights Holder | National Academy of Sciences |
| Subject Keyword | General Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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