Effects of solid solutions on the superconducting properties of Gd–Ba–Cu–O superconductors
Effects of solid solutions on the superconducting properties of Gd–Ba–Cu–O superconductors
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固溶体对Gd-Ba-Cu-O超导体超导性能的影响
DOI：
10.1088/0953-2048/18/10/011
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发表时间：
2005
影响因子：
3.6
通讯作者：
Yijun Feng
中科院分区：
文献类型：
--
作者：
H. Zhang;Yi Liu;Hong Li;J. Qu;Xiyu Li;Yijun Feng
通过磁化强度和电阻率测量研究了由GdBa 2Cu 3 O 7-δ（Gd 123），Gd 2BaCuO 5（Gd 211）和Gd 1 + yBa 2-yCu 3 O 7-δ组成的名义单畴块材Gd 1 + 2xBa 2 + xCu 3 + xO 7-δ（x = 0，0.1，0.2，0.3，0.4）的超导性质。随着Gd 211含量x的增加，对于x = 0.2的样品，捕获的磁场达到最大值。临界电流密度Jc随磁场B的变化曲线中的第二个峰值在x = 0.2的样品中向高磁场方向移动，而在x>0.2的样品中向低磁场方向下降。电阻率ρab的两个超导转变表明低Tc团簇，即Gd 1 + yBa 2 − yCu 3 O 7 −δ固溶体，散布在GdBa 2 Cu 3 O 7 −δ超导基体中。对于x = 0.2的样品，由组分涨落引起的δTc钉扎应该是Jc和陷阱场增强的原因。
The superconducting properties of the nominal Gd1+2xBa2+xCu3+xO7−δ (x = 0, 0.1, 0.2, 0.3, 0.4) single-domain bulks which consist of GdBa2Cu3O7−δ (Gd123), Gd2BaCuO5 (Gd211) and Gd1+yBa2−yCu3O7−δ, have been investigated through magnetization and resistivity measurements. With increasing Gd211 content x, the trapped magnetic field reaches a maximum for the sample x = 0.2. The second peak in the critical current density Jc versus magnetic field B curve shifts toward the high magnetic regime for the sample x = 0.2 compared with that for the sample x = 0, but decreases to low magnetic field for the samples x>0.2. Two superconducting transitions in resistivity ρab indicate that the low Tc clusters, i.e. Gd1+yBa2−yCu3O7−δ solid solutions, are interspersed in the GdBa2Cu3O7−δ superconducting matrix. The δTc pinning resulting from the compositional fluctuations should be responsible for the enhancement of Jc and the trapped field for the sample x = 0.2.