Abstract
When a strong electric field is applied to a suspension of micron-sized high T c superconducting particles in liquid nitrogen, the particles quickly aggregate together to form balls. The millimeter-size balls hold over 10 6 particles each. They are sturdy, surviving constant heavy collisions with the electrodes. The ball formation is a results of superconductivity. As the c-axis coherence length is shorter than the Thomas-Fermi screening length, the electric field produced by the charged surface layer turns off the coupling between the interlayers. This loss of Josephson energy becomes a positive surface energy. Its minimization leads to the balls.
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