Statistic Ensemble Theory of Small Superconducting Grains
CHEN Zhi-Qian1,2, ZHENG Ren-Rong2,3
1Department of Physics, Southwest China Normal University, Chongqing 400715
2Department of Physics, Suzhou University, Suzhou 215006
3Department of Physics, Shanghai Teachers’ University, Shanghai 200234
Statistic Ensemble Theory of Small Superconducting Grains
CHEN Zhi-Qian1,2;ZHENG Ren-Rong2,3
1Department of Physics, Southwest China Normal University, Chongqing 400715
2Department of Physics, Suzhou University, Suzhou 215006
3Department of Physics, Shanghai Teachers’ University, Shanghai 200234
Abstract： We apply random matrix theory to small metallic grains in different spin-states of S=0, 1/2, 1, 3/2, 2, 5/2, ..., and find that there exist theoretical critical level spacings dc at which the superconductivity would break down. 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 the superconducting enhancement.
2001, Vol. 18 
