| Summary: | 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.
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