Superconducting characteristics of 4-Å carbon nanotube-zeolite composite

Rolf W. Lortz, Qiucen Zhang, Wu Shi, JiangTing Ye, Chunyin Qiu, Zhe Wang, Hongtao He, Ping Sheng, Tiezheng Qian, Zikang Tang, Ning Wang, Xixiang Zhang, Jiannong Wang, Cheting Chan

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We have fabricated nanocomposites consisting of 4-A 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 >2T, 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 5Tor beyond.
Original languageEnglish (US)
Pages (from-to)7299-7303
Number of pages5
JournalProceedings of the National Academy of Sciences
Issue number18
StatePublished - Apr 15 2009

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