多个非磁性杂质对铜氧化物高温超导体局域态密度影响的研究  

Local Density of States Around Many Nonmagnetic Impurities in Cuprate Superconductors

作　　者：闫旭[1] 黄展鹏[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）》2010年第1期41-44,共4页Journal of Qingdao University(Natural Science Edition)

基　　金：国家自然科学资金项目(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平面内多个非磁性杂质对铜氧化物高温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,而在杂质点附近由于杂质的存在产生零能量诱导峰,同时超导相干峰受到强烈抑制。随着杂质间距的增大,杂质点附近超导相干峰受到的抑制逐渐变小,同时零能量诱导峰的强度也随着变小。Using the Gutzwiller approximation and Bogoliubov-de Gennes （BdG） theory, the local density of states around many nonmagnetic impurities in cuprate superconductors are studied under the t-J- U model. Results show that away from the impurities, the local density of state presents typical ＂V＂ shape asymmetric curve; zero-energy peaks are induced around the impurities, and the superconducting coherence peaks are strongly suppressed. With the increasing of the distance among the impurities, the superconducting coherence peaks around the impurities are less suppressed, and the intensity of the zero-energy peaks decrease.

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

分 类 号：O511.3[一般工业技术—材料科学与工程]