Hydrostatic pressure on HgBa2CaCu2O6+ and HgBa2Ca2Cu3O8+
نویسندگان
چکیده
The superconducting transition temperature T, and its pressure dependence dT,IdP of HgBazCaCuz06+8 (Hg-1212) and HgBa,[email protected]+8 (Hg-1223) were measured up to 17 kbar. T, increases with pressure approximately linearly for both compounds before oxidation. However, the nonlinearity in the T,-P correlation shows up after oxidation in both compounds. For Hg-1212, the average dT,ldP decreases as oxygen doping increases, while it increases in Hg-1223. These observations are in conflict with the modsed pressure-induced charge-transfer model, but might be attributed to the possible existence of fine electronic structure. These observations suggest that a T, much higher than 140 K might be achievable in Hg-1223 by means of higher physical or chemical pressure.
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