Abstract
It is found that the magnetization curves of samples of fragments of cathode carbon deposits with a high content of multiwalled nanotubes exhibit a pronounced irreversible character, attesting to the induction of persistent currents in the samples and to magnetic flux trapping, as happens in a multiply connected superconducting structure. A decrease of the trapped flux in time could not be observed at low (helium) temperatures with a measurement time of about 20 h. For intermediate (∼30 K) and room temperatures the trapped magnetic flux decays slowly with characteristic relaxation times of the order of 150 and 15 h, respectively.
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Pis’ma Zh. Éksp. Teor. Fiz. 70, No. 7, 457–462 (10 October 1999)
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Tsebro, V.I., Omel’yanovskii, O.E. & Moravskii, A.P. Persistent currents and magnetic flux trapping in fragments of carbon deposits containing multiwalled nanotubes. Jetp Lett. 70, 462–468 (1999). https://doi.org/10.1134/1.568197
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DOI: https://doi.org/10.1134/1.568197