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首页> 外文期刊>Journal of Superconductivity >Nb Substituted Cu{sub}0.5Tl{sub}0.5Ba{sub}2(Ca{sub}3Nb{sub}1)Cu{sub}5O{sub}(14-δ) and Cu{sub}0.5Tl{sub}0.5Ba{sub}2(Ca{sub}4Nb{sub}1)Cu{sub}6O{sub}(16-δ) Superconductors
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Nb Substituted Cu{sub}0.5Tl{sub}0.5Ba{sub}2(Ca{sub}3Nb{sub}1)Cu{sub}5O{sub}(14-δ) and Cu{sub}0.5Tl{sub}0.5Ba{sub}2(Ca{sub}4Nb{sub}1)Cu{sub}6O{sub}(16-δ) Superconductors

机译：Nb取代的Cu {sub} 0.5Tl {sub} 0.5Ba {sub} 2（Ca {sub} 3Nb {sub} 1）Cu {sub} 5O {sub}（14-δ）和Cu {sub} 0.5Tl {sub } 0.5Ba {sub} 2（Ca {sub} 4Nb {sub} 1）Cu {sub} 6O {sub}（16-δ）超导体

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摘要

The effects of higher electro-negativity Nb substitution on the Ca site in Cu{sub}0.5Tl{sub}0.5Ba{sub}2 (Ca{sub}3Nb{sub}1)Cu{sub}5O{sub}(14-δ) and Cu{sub}0.5Tl{sub}0.5Ba{sub}2(Ca{sub}4Nb{sub}1)Cu{sub}6O{sub}(16-δ) superconductors have been investigated. The Nb doping has been found to increase the oxygen contents in Cu{sub}0.5Tl{sub}0.5Ba{sub}2O{sub}(4-δ) charge reservoir layer of the final compound. The post-annealing in the N{sub}2 atmosphere has been found to improve the superconducting properties; however, O{sub}2 annealing produced the material with inferior superconducting properties. The quantity of diamagnetism is increased with post-annealing in the nitrogen atmosphere; as N{sub}2 annealing helps in the formation of material with optimum carriers concentration in the CuO{sub}2 planes, which is done by the change in the charge state of thallium from Tl{sup}(3+) to Tl{sup}(1+). The Nb substitution has been found to develop the higher CuO{sub}2 planner phases such as Cu{sub}0.5Tl{sub}0.5Ba{sub}2Ca{sub}(n-2)Nb{sub}1Cu{sub}nO{sub}(2n+4-δ) (n=5,6) with enhanced TVs.
机译：高负电性Nb取代对Cu {sub} 0.5Tl {sub} 0.5Ba {sub} 2（Ca {sub} 3Nb {sub} 1）Cu {sub} 5O {sub} 2中Ca位点的影响（14 -δ）和Cu {sub} 0.5Tl {sub} 0.5Ba {sub} 2（Ca {sub} 4Nb {sub} 1）Cu {sub} 6O {sub}（16-δ）超导体。已经发现，Nb掺杂会增加最终化合物的Cu {sub} 0.5Tl {sub} 0.5Ba {sub} 2O {sub}（4-δ）电荷存储层中的氧含量。已经发现，在N {sub} 2气氛中进行后退火可以改善超导性能。然而，O {sub} 2退火产生的材料具有超导性能较差。在氮气氛中，随着退火的进行，反磁性的量增加。因为N {sub} 2退火有助于形成CuO {sub} 2平面中具有最佳载流子浓度的材料，这是通过将th的电荷状态从Tl {sup}（3+）变为Tl { sup}（1+）。已发现Nb替代可发展更高的CuO {sub} 2规划阶段，例如Cu {sub} 0.5Tl {sub} 0.5Ba {sub} 2Ca {sub}（n-2）Nb {sub} 1Cu {sub}具有增强型电视的nO {sub}（2n +4-δ）（n = 5,6）。

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