High-pressure phase diagram of Bi2Sr2CaCu2O8+delta single crystals

[摘要] We have investigated the pressure dependence of the superconducting transition temperature T-c up to 18 GPa of Bi2Sr2CaCu2O8+delta single crystals ranging from the highly underdoped through the nearly optimally doped to the highly overdoped level. For all three samples studied, T-c is found to increase initially and then saturate at some critical pressure P-c, but decrease modestly with further increasing pressure. Oxygen doping has a tendency to reduce the increase of T-c and P-c. A high-pressure phase diagram between the saturated T-c and P-c is then obtained. Theoretical interpretation is given by using the competition between the hole carrier density and pairing interaction strength based on the high-pressure transport data of the resistivity and Hall coefficient in this system.

[发布日期] 2004-12-01

[关键词] SUPERCONDUCTING TRANSITION-TEMPERATURE;HIGH-TC SUPERCONDUCTORS;HYDROSTATIC-PRESSURE;OXYGEN-CONTENT;DEPENDENCE;GPA;YBA2CU3O7-Y;ANISOTROPY