Experimental demonstration of magnetic levitation at 77 K with a Bi-Pb-Sr-Ca-Cu-O cylinder, suggesting potential applications in advanced magnetic systems.
A permanent magnet was levitated inside a sintered Bi-Pb-Sr-Ca-Cu-O superconducting cylinder at 77 K. The superconducting cylinder (outside diameter: 45 mm, inside diameter: 40 mm, height: 85 mm) was manufactured by a powder sintering process. The critical temperature was 110 K, and the critical current density was about 900 A/cm 2 at 77 K, 0T. The levitation force is due to the trapped magnetic flux lines in the interior space of the cylinder. It is necessary for the levitation that there flows a large critical current on the loop path around the superconducting cylinder.
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Hasebe et al. (1991) studied this question.
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