金属小粒子不同自旋态超导电性统计系综研究  

Statistic ensemble study of superconductivity in different spin-states in small metallic grains

作　　者：陈志谦[1] 郑仁蓉[2] 

机构地区：[1]西南师范大学物理系,重庆400715 [2]上海师范大学物理系,上海200234

出　　处：《物理学报》2002年第7期1604-1607,共4页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 14 72 0 7);重庆市科学技术委员会应用基础项目资助的课题

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 Δ(0 ) =13 81,1 85 ,0 81,0 5 0 ,0 36 ,0 2 8,…随粒子尺寸的减小 ,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S =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/ Δ (c)=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=0 there actually exists enhancement of superconductivity.

关 键 词：自旋态 统计系统 金属小粒子 超导电性 无规矩阵 

分 类 号：O511[理学—低温物理] TG113.22[理学—物理]