CuO_2平面外非磁性杂质对gossamer超导体局域态密度的影响  

Effect of Nonmagnetic Impurity out of CuO_2 Plane on Local Density of States in Gossamer Superconductors

作　　者：万霞霞[1] 任玉英[1] 袁峰[1] 

机构地区：[1]青岛大学物理科学学院,山东青岛266071

出　　处：《青岛大学学报（自然科学版）》2012年第2期34-37,共4页Journal of Qingdao University(Natural Science Edition)

基　　金：国家自然科学基金资助(No.10774082)

摘　　要：在t-J-U模型下,应用Gutzwiller平均场近似及Bogoliubov-de Gennes(BdG)理论研究了CuO2平面外单个非磁性杂质对gossamer超导体电子局域态密度的影响。结果表明,在远离杂质点处电子局域态密度呈现出典型的非对称性,在杂质点附近平面外的非磁性杂质使超导能隙变小,但是并没有明显破坏超导。而在杂质点附近由于平面外的杂质势没有被有效屏蔽而导致CuO2平面内电子的分布在纳米尺度上存在着明显的不均匀性。Using the Gutzwiller approximation and Bogoliubov-de Gennes （BdG） theory, the local density of states around the nonmagnetic impurity out of the CuO2 plane in gossamer superconductors is studied within the t-J-U model. Results show that the LDOS shows typical ＂V＂ shape asmmetric curve away from the impurities. The superconducting gap reduces around the impurity, but the impurity does not destroy the superconducting. We find that the inhomogeneity originates from nonlinear screening of the ionic potential which was introduced by the doped nonmagnetic impurity.

关 键 词：CuO2平面外非磁性杂质 Gutzwiller近似 BdG理论 电子局域态密度 

分 类 号：O511[理学—低温物理]