金属小粒子超导电性研究  

Superconductivity of Different Spin-States in Ultrasmall Metallic Grains

作　　者：郑仁蓉[1] 陈志谦[2] 

机构地区：[1]上海师范大学物理系,上海200234 [2]西南师范大学物理系

出　　处：《云南民族学院学报（自然科学版）》2001年第1期249-252,共4页Journal of Yunnan University of The Nationalities(Natural Sciences Edition)

基　　金：国家自然科学基金项目!基金号 (19875 0 40 )

摘　　要：用统计系综理论对遵从高斯正交系综的所有金属小粒子的不同自旋态SZ =0 ,1/ 2 ,1,3/ 2 ,2 ,5 / 2…进行了研究 .发现以上各态均存在临界能间距dc/△ (0 ) =13 .81,1.85 ,0 .81,0 .5 0 ,0 .36 ,0 .2 8… .随着粒子尺寸的减小 ,其超导电性终究会消失 ;金属小粒子的自旋态越高 ,临界能间距dc 越小 .对自旋SZ =0的态 ,确实存在超导增强效应 .We study the different spin-states of S z=0, 1/2,1,3/2,2,5/2,…of different ultrasmall metallic grains which observe the rules in Gauss orthogonal ensemble by the theory of statistic ensembles, and find there exist critical level spacings d c/△(0)=13.81,1.85,0.81,0.50,0.36,0.28,…,at which the superconductivity would vanish. We also find that the higher the spin-state, the smaller the critical level spacing, and for the state of S z=0 there actually exists the superconducting enhancement.

关 键 词：金属小粒子 超导电性 自旋态 临界能间距 超导增强效应 能级结构 高斯正交系统 

分 类 号：O511.2[理学—低温物理]