The Gravitational Mass at the Superconducting State
  It will be shown that the gravitational masses of the electrons of a superconducting material are strongly negative. Particularly, for an amount of mercury (Hg) at the transition temperature, Tc = 4.15 K, the negative gravitational masses of the electrons decrease the total gravitational mass of the Hg of approximately 0.1 percent. The weight reduction increase when the Hg is spinning inside a magnetic field or when it is placed into a strong oscillating EM field. 
Fran De Aquino (Maranhao State University, Brazil)