强关联对Van　Hove奇异性及超导电性的影响  

Effect of strongly-correlation on superconductivity and Van Hove singularity

作　　者：裘新良[1] 卢亚锋[1] 

机构地区：[1]陕西师范大学物理学系

出　　处：《陕西师大学报（自然科学版）》1994年第2期19-21,共3页Journal of Shaanxi Normal University(Natural Science Edition)

摘　　要：分析电子间强关联效应对二维态密度的ＶａｎＨｏｖｅ奇异性及超导电性的影响．结果表明，强关联不改变二维态密度的ＶａｎＨｏｖｅ奇异性，但产生一常数态密度．此常数态密度与掺杂有关，从而认为超导体的Ｔｃ与掺杂有关；强关联还将使同位素效应的指数（ａ）进一步减小，而且随掺杂变化而变化．he effect of strong-correlation on Van Hove singularity and superconductivity is investigated. It has been showed that strong-correlation does not change the Van Hove singularity of two-dimensional state density, but Leads to a constant state density, which has a relation With doping.. It is proposed that the superconducting Tc and isotope effect αwill be changed with doping

关 键 词：强关联 超导电性 范霍夫奇异性 

分 类 号：O511.2[理学—低温物理]