非磁性杂质对gossamer超导体局域态密度的影响  

Influence of Nonmagnetic Impurities on Local Density of States in Gossamer Superconductors

作　　者：逄娜娜 杨双生 袁峰[1] 

机构地区：[1]青岛大学物理科学学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2014年第3期28-31,共4页Journal of Qingdao University(Natural Science Edition)

基　　金：国家自然科学基金(批准号:10774082)资助

摘　　要：从t-J-U模型出发,利用Gutzwiller近似和Bogoliubov-de Gennes(BdG)方程对CuO2平面外和平面内同时存在非磁性杂质时对gossamer超导体电子局域态密度的影响进行了研究。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。当平面内杂质不是很强时,平面外杂质使其附近超导能隙变小,但是并没有明显破坏超导。而由于平面内外同时存在的杂质而导致CuO2平面内电子的分布在更大范围内在纳米尺度上存在着显著的不均匀性。Using the Gutzwiller approximation and Bogoliubov-de Gennes theory, the local density of states （LDOS） around the nonmagnetic impurities which lie both in and out of the CuO2 plane in gossamer superconductors are studied within the t-J-U model. Results show that far away from the impurities, the LDOS shows typical ＂V＂ shape asmmetric curve. The superconducting gap reduces around the impurities, but the out-of-plane impurities do not destroy the superconductivity. We find that the existence of the non magnetic impurities in and out of the CuO2 plane makes the inhomogeneity remarkable in a wider range.

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

分 类 号：O52[理学—高压高温物理]