Origin of Pressure Effect on Critical Temperature in Electron Superconductors

• Main Authors: Wei-Jyh Huang, 黃威智
• Other Authors: Ying-Chung Chen,Hung-Duen Yang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/89185204922005778606

碩士 === 國立中山大學 === 電機工程研究所 === 83 === In this paper,we study 2-1-4 series on electron superconductors (T'-structure).The carrier of this stucture is electron,the critical temperature of this series of samples will decrease with increasing pressure;the other 2-1-4 series are hole super- conductors(T-structure and T*-structure),the critical temper- ature of this series will increase with increasing pressure.The characteristics of this two types(n-type and p-type) are opposite.If we dope two different ions on electron super- conductors [R(1-x)R'(x)](1.85)Ce(0.15)CuO(4)[R=Pr,Nd,Sm,Eu;R'= Y, Gd],although Y-ion is smaller and nonmagnetic,Gd-ion is larger and magnetic,according to results of measurements of X- ray and computing of lattice parameters and measurements of resistivity and measurements of SQUID,we find the effect of ionic size is larger than the effect of magnet.According to the datas of this paper we find internal pressure effect will change the critical temperature of electron superconductors.