The significant drop in resistance around 200K in superconducting Hg-based compounds

Abstract A significant drop in the resistance around 250K [1] and 230K [2] were repeatedly observed in the above experiments on superconducting Hg-based compounds. We report here the electrical resistivity measurements on pure (as determined by X-ray powder technique) Hg-1223 phase, which has shown a partial or total drop in resistivity around 200K but with no significant observation of diamagnetic signal. We are sure that the drop in resistance for our Hg-based compounds at 200K is not due to the presence of liquid Mercury or Hg Au alloys in the sample since our samples did not contain any Hg Au alloys. We rather believe that the drop in resistivity is due to superconductivity or other mechanisms.