基于声子-激子模型的高温超导电性  

Study of Superconductivity Based on the Phonon-Exciton Mechanism

作　　者：李贞姬[1] 辜承慰[1] 

机构地区：[1]南方医科大学生物医学工程学院,广东广州510515

出　　处：《聊城大学学报（自然科学版）》2011年第2期40-42,共3页Journal of Liaocheng University:Natural Science Edition

基　　金：南方医科大学博士启动基金(B1000365)

摘　　要：把推广的BCS-Eliashberg理论即声子-激子模型作为YBCO铜氧化物超导体的可能机制,采用McMiilan的能隙函数模型导出了Tc的表示式,初步探明了氧同位素指数oβ的计算方法.以上理论作为根据,在平均场近似下计算了YBa2Cu2O7-δ的临界温度Tc和氧同位素指数βo.在数字计算中,把激子的振动看作光频支振动,从而采用了爱因斯坦近似.理论分析和计算结果表明,该模型适合于YBa2Cu3O7-δ铜氧化物超导体.Based on the phonon-exciton mechanism, the superconductivity oI yttrlum uartuLu coVVcl oxide （YBCO）system is explained. The transition temperature Tc and the oxygen isotopic coefficient βa＇ s formulae are derived by McMillan＇s energy gap function,and these expressions are reduced by using the Einstein spectrum. The theoretical analysis and caleulational results show that the superconductivity of YB3 Cu2O7-n system maybe described by phonon-exciton model.

关 键 词：声子-激子模型 临界温度 同位素效应 YBCO铜氧化物超导体 

分 类 号：O511.2[理学—低温物理]