Weak gravitation shielding properties of composite bulk YBa_2Cu_3O_{7-x} superconductor below 70 K under e.m. field

Details Weak gravitation shielding properties of composite bulk YBa_2Cu_3O_{7-x} superconductor below 70 K under e.m. field Weak gravitation shielding properties of composite bulk YBa_2Cu_3O_{7-x} superconductor below 70 K under e.m. field

1997-01-10

arxiv.org/abs/cond-mat/9701074v3

Physics

Condensed Matter

Superconductivity

LaTeX, 14 pages. 9 PostScript figures

Scientific paper

A high-temperature YBa_2Cu_3O_{7-x} bulk ceramic superconductor with composite structure has revealed weak shielding properties against gravitational force while in a levitating state at temperatures below 70 K. A toroidal disk was prepared using conventional ceramic technology in combination with melt-texture growth. Two solenoids were placed around the disk in order to initiate the current inside it and to rotate the disk about its central axis. Samples placed over the rotating disk initially demonstrated a weight loss of 0.3-0.5%. When the rotation speed was slowly reduced by changing the current in the solenoids, the shielding effect became considerably higher and reached 1.9-2.1% at maximum.

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