自旋三重态Sr2RuO4超导能隙的p波对称性  

The p-Wave Symmetry of the Superconducting Gaps of Sr_2RuO_4 in the Spin Triplet State

作　　者：王琼[1] 李铭[1] 

机构地区：[1]华南师范大学物理与电信工程学院,量子信息技术实验室,广东广州510006

出　　处：《华南师范大学学报（自然科学版）》2013年第1期47-50,共4页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(10874049);广东省自然科学基金项目(07005834)

摘　　要：在三带模型下,考虑带间和带内的在位库伦排斥、洪特耦合以及带内的配对耦合势,采用RPA近似求解能隙方程,得到了Sr2RuO4三个能带上的自旋三重态能隙.计算结果表明,相互作用势在格点上表现为在位的排斥,以及近邻和次近邻格点之间的吸引.xy轨道的配对势近似呈四重旋转对称,而yz和zx轨道的配对势明显以横向方式展开,呈二重旋转对称.同时,在自旋涨落和电荷涨落作用下,电子之间的自旋三重态配对能成功再现Sr2RuO4的p波形式的能隙结构.随着温度上升,能隙逐渐减小到0,得到转变温度与实验结果基本一致.The spin triplet gaps of the three orhitals of Sr_2RuO_4 are obtained by solving the gap equation in the ran- dom phase approach. The on -site inter- and intra -band Coulumb repulsion, the Hund＇s coupling and the intra - band pairing are considered in the approach. The computation shows that the pairing couplings induced by the spin and charge fluctuation are on- site repulsive and attractive between the neighboring and the next neighboring sites. The pairing coupling of the xy orbital is four - folded symmetric and those of the yz and zx orbitals are two - folded symmetric. As the temperature increases, the gaps decrease to zero at a transition temperature of ksTc ≈0. 002 3t_（x2）.

关 键 词：自旋三重态 p波超导能隙 Sr2RuO4 

分 类 号：O157.5[理学—数学]