Superconductivity in the Bi2Sr3-xLnxCu2OySystem and the Excess of Hole Concentration in Bi2Sr2CanCu1+nOy(n=0 and 1)
作者： Tohru Den , Jun Akimitsu
DOI: 10.1143/JJAP.28.L193
关键词: Electrical resistivity and conductivity 、 Analytical chemistry 、 Nuclear chemistry 、 Superconductivity 、 Magnetization 、 Magnetic susceptibility 、 Phase (matter) 、 Chemistry 、 Powder diffraction 、 X-ray crystallography 、 High-temperature superconductivity 、 General Engineering 、 General Physics and Astronomy
摘要: A new family of high-Tc superconductors Bi2Sr3-xLnxCu2Oy(Ln=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Y) has been found by means resistivity magnetization measurements. The highest superconducting transition temperature was obtained when the substitution concentration x about 0.3. X-ray powder diffraction measurement showed that Bi2Sr2-xLnxCuOy (221 phase) is stable for x<0.3 Bi2Sr3-xLnxCu2Oy (232 becomes major exceeds 232 phase same structure as Bi2Sr2CaCu2Oy. It also demonstrated hole number p [Cu-O]+p in Bi2Sr2CuOy Bi2Sr2CaCu2Oy excessive compared with proper value giving Tc.
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