Pressure dependence of the superconducting critical temperature of the Tl0.5Pb0.5Sr2Ca1-xYxCu2O7 system

Article

关键词: CU-O SYSTEM;    TRANSITION-TEMPERATURE;    CHARGE-TRANSFER;    CARRIER CONCENTRATION;    HOLE CONCENTRATION;    50 GPA;    T-C;    YBA2CU3O7-DELTA;    OXIDES;    MODEL;   

DOI  :  10.1103/PhysRevB.55.11832

来源: SCIE

【 摘 要 】

Using a cryogenic diamond anvil cell the pressure dependence of the superconducting transition temperature T-c of Tl0.5Pb0.5Sr2Ca1-xYxCu2O7 for x = 0.0, 0.1, 0.2, and 0.35 has been measured resistively up to similar to 20 GPa. In high-T-c superconductors there are two contributions to the pressure dependence of T-c: one related to pressure-induced charge transfer and one due to intrinsic effects. In the present experiment these contributions could be separated using a simple phenomenological model which incorporates the effect of changes in both the yttrium content x and the applied pressure p on T-c. In this system it is found that there hardly is any charge transfer by pressure so that the intrinsic pressure effect is the main contribution to delta T-c/delta p. The maximum T-c which can be reached in this system is 112 K.

【 授权许可】

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