The Correlation of Miller Indices with the Conductivity Mechanism of Cu-Based High-Tc Superconductor

Israa Maher,Emad K Al-Shakarchi

doi:10.4236/jmp.2017.88075

Abstract

The high temperature superconductor of CuBa2Ca2Cu3O8+δ(Cu-1223) was synthesized experimentally by solid-state reaction. There were many pa-rameters affecting the preparation technique such as oxygen flow, sintering temperature, sintering time, and compacted pressure. The XRD-pattern exhibited a tetragonal phase for both Cu-1223, and Cu-1212. The resistivity measurement was considered the important experiment to show the predominant phase of superconductor if it was a high phase or low phase. The critical temperature (Tc) was about (128 K) for the high phase of Cu-1223, whereas the low phase of (Cu-1212) appeared at (Tc = 64 K). The correlation between the Miller indices and resistivity measurements was a good tool to predicate the expected mechanism of conductivity within the unit cell. It was clear that the arrangement of these planes was aligned in the a-c direction. That should make the motion of the charge to be simpler by a stepping plane toward c-axis.

Highlights

IntroductionThe normal solid-state reaction was not used in preparation of Hg-family superconductor because of high evaporation of Hg-element in the mixture; to avoid this problem, the technique of a sealed quartz tube applied thermally in solid-state reaction [11]
The high-Tc superconductor cuprate like HgBa2Can-1CunO2n+2+δ, with different values of (n = 1, 2, 3) was recorded a critical temperature of about (Tc = 138 K) at (n = 3) [1]
The obtained results showed the peaks related to high superconductor phase Cu-1223, which were more than the low phase of Cu-1212

Summary

Introduction

The normal solid-state reaction was not used in preparation of Hg-family superconductor because of high evaporation of Hg-element in the mixture; to avoid this problem, the technique of a sealed quartz tube applied thermally in solid-state reaction [11]. The solving of this problem was the replacing of a metal ion instead of Hg-ion such as Cu-ion, and producing a new family like Hg-1223 family [12] [13]. The previous studies appeared the multi-phase in (Hg-1223) compound, and the multiphase is acceptable in Cu-1223

Experimental Work

Results and Discussion

Conclusion