Highly enhanced superconducting properties of Eu-doped (Bi,Pb)-2212

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• 作者：P.M. Sarun ; S. Vinu ; R. Shabna ; A. Biju ; U. Syamaprasad
• 关键词：Superconductors ; Critical temperature ; Critical current density
• 刊名：Materials Letters
• 出版年：2008
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：30 June 2008
• 卷：62
• 期：17-18
• 页码：2725-2728
• 文件大小：774 K

摘要

The structural and superconducting properties of Eu-doped (Bi,Pb)-2212 superconductor have been studied. Eu concentration is varied from x = 0.0 to 0.4 in a general stoichiometry of Bi_1.6Pb_0.5Sr_2−xEu_xCa_1.1Cu_2.1O_y. It is found that the Eu atoms enter into the crystal structure by replacing Sr atoms and induce significant changes in lattice parameters, microstructure, hole-concentration and normal-state conductivity of the system. The critical temperature (T_C) and critical current density (J_C) at self-field of the Eu-doped samples enhanced considerably for optimum doping levels. Maximum T_C-onset of 95.7 K (for x = 0.2) and J_C of 1196 A/cm² at 64 K (for x = 0.1) were observed for doped samples as against 79.8 K and 105 A/cm², respectively, for the pure sample. The results are discussed on the basis of the changes in hole-concentration due to Eu-doping.