Abstract
The authors have measured a critical shielding flux density B/sub 01/ of YBa/sub 2/Cu/sub 3/O/sub y/ superconducting plates. Sintered specimens were assumed to be bulk superconductors with interconnected sub-structures and were considered to screen the magnetic field completely for applied fields of less than B/sub 01/. The critical shielding flux density was proportional to the thickness d of the specimen, as expected from an equation derived from the Bean-London critical state model. The authors have obtained 16 G/mm as a maximum shielding capacity of B/sub 01//d. The measured flux showed hysteresis when the applied field was raised above B/sub 01//.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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