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

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.