Observation of the Meissner state in superconducting arrays of 4-Å carbon nanotubes
Chao Ieong, Zhe Wang, Wu Shi, Yuxing Wang, Ning Wang, Zikang Tang, Ping Sheng, Rolf Lortz
DOI 10.1103/PhysRevB.83.184512 · Physical Review B
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Abstract
We report clear observations of the magnetic Meissner effect in arrays of superconducting 4-Å carbon nanotubes grown in the linear channels of AlPO4-5 (AFI) zeolite single crystals. Both bulk magnetization and magnetic torque experiments show a pronounced signature of the lower critical Hc1 transition, a difference in zero-field cooled and field cooled branches during temperature sweeps below 6 K, and signatures of one-dimensional superconducting fluctuations below ∼15–18 K. These experiments extend the magnetic phase diagram we obtained previously by resistive experiments [Z. Wang et al., Phys. Rev. B 81, 174530 (2010)] towards low magnetic fields and within the range of zero resistance.
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