【摘要】 我们测量了千赫兹范围内超导掺Pr系列的Bi2 Sr2 Ca1 -xPrxCu2 Oy 单晶从液氮温度至室温的微结构弛豫谱 ,发现该样品在 1 2 0K附近存在一个损耗峰P .该峰的强度先随Pr含量x的增加而变大 ,但到达x～ 0 .1 1 0 .1 7之间时 ,出现最大值 ,而后又随x的增加而减小 .这种行为与超导转变温度Tc 与x的关系一致 ,这表明该峰与超导机制密切相关 .文中还对该峰的机制进行了讨论 .更多还原

【Abstract】 The mechanical relaxation spectra of Bi-2Sr-2Ca-{1-x}Pr-xCu-2O-{8δ} single crystals were measured from liquid nitrogen temperature to room temperature at frequency of kilohertz. An internal friction peak P has been discovered at around 120K. The height of the peak P first increases with increasing Pr concentration x. When x～0.11-0.17, the height of P reaches its maximum. Then it decreases if x continues to increase. Such behavior is similar to the superconducting transition temperature, which suggests that it is related with the superconducting mechanism. We propose that if both phase separation and electronic lattice or stripe are concerned, the peak can be explained.更多还原