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The Resistivity Measurements of HgBa2Ca2Cu3O8+x and HgBa2Ca3Cu4O10+x Superconductors under High Pressure

The superconductivity of the HgBa2Ca2Cu3O8+x (1223) and HgBa2Ca3Cu4O10+x (1234) phases was studied by resistivity measurements under high pressure. The highest onset Tc (Tco) was 156 K at 25 GPa for a 1223 and 1234 mixed-phase sample and 140 K at 13 GPa for a 1223-phase sample. The Tco decreased after the maximum point with the increase of pressure.