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/cm2 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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