ELECTRICAL-TRANSPORT PROPERTIES OF THE RARE-EARTH ION SUBSTITUTED (TL,PS)SR1.6BA0.4(CA0.8R0.2)CU2OX SUPERCONDUCTING SYSTEM

被引:2
作者
HONG, Q
WANG, JH
机构
[1] Superconductive Materials Laboratory, Department of Chemistry, Buffalo, NY 14214, Acheson Hall State University New York
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1993年 / 214卷 / 3-4期
关键词
D O I
10.1016/0921-4534(93)90828-E
中图分类号
O59 [应用物理学];
学科分类号
摘要
Systematic studies on the electrical transport properties of a series of rare-earth (RE) ion substituted (T1, Pb)Sr1.6Ba0.4(Ca0.8R0.2)Cu2Ox superconductors are performed by measuring the transport critical temperature T(c) and critical current density J(c). It is found that the substituted samples by trivalent RE elements exhibit similar T(c)'s (approximately 99 K), which are much higher than that of the unsubstituted sample (approximately 73 K). However, the sample doped by the same amount of Th shows a small change in T(c) while that of the Ce doped sample decreases dramatically from that of the unsubstituted material. We attribute this effect to the mixed valence of RE ions. The J(c) does not vary significantly from sample to sample for materials exhibiting a high T(c), indicating that the magnetic moment of the unpaired 4f-electrons has essentially no effect on the scattering of superconducting carriers. The J(c) of the unsubstituted material has been found to be 1.7 X 10(5) A/cm2 at 4.2 K in the absence of an external field, which represents the highest J(c) achieved in T1-based polycrystalline superconductors so far. The results are also compared with those obtained in the RE substituted YBCO and BSCCO systems.
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页码:286 / 290
页数:5
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