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首页> 外文期刊>Physica, C. Superconductivity and its applications >Composition dependences of Tc, Jc, physical property and crystal structure of Bi_(1.8)Pb_(0.3)Sr_(2.0)Ca _(0.9)Y_(0.1)Cu_(2.0-x)M_xO_y (M = Zr, Zn) superconducting oxide
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Composition dependences of Tc, Jc, physical property and crystal structure of Bi_(1.8)Pb_(0.3)Sr_(2.0)Ca _(0.9)Y_(0.1)Cu_(2.0-x)M_xO_y (M = Zr, Zn) superconducting oxide

机译：Bi_（1.8）Pb_（0.3）Sr_（2.0）Ca _（0.9）Y_（0.1）Cu_（2.0-x）M_xO_y（M = Zr，Zn）超导氧化物的Tc，Jc的组成依赖性，物理性质和晶体结构

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摘要

In this study, we focused on bulks and thin films of Bi _(1.8)Pb_(0.3)Sr_(2.0)Ca _(0.9)Y_(0.1)Cu_(2.0-x)M_xO_y, and replaced Cu by Zr~(4+) and Zn~(2+). From the electrical conductivity measurements on the bulk samples, it was found that Tc became higher by a partial substitution of Zr~(4+), and exhibited a maximum value in the sample with the Zr~(4+) content of 0.05. On the other hand, Tc was decreased by the Zn~(2+) substitution. These results suggested that it was possible to control a carrier concentration by the Zr- and Zn-substitutions. Indeed, an average valence of the Cu, determined by a chelate titration, was changed by these substitutions. Similar tendency of the superconducting properties was also observed in the case of the film samples. In order to investigate crystal structures in detail, we measured neutron diffraction patterns, and then performed the Rietveld analysis. As a result, it was clarified that the (Cu, Zr)-O_2 layers became flat by the Zr-substitution. Such a structure change may be one of the reasons why the substitution improved the superconducting properties.
机译：在这项研究中，我们专注于Bi _（1.8）Pb_（0.3）Sr_（2.0）Ca _（0.9）Y_（0.1）Cu_（2.0-x）M_xO_y的块状和薄膜，并用Zr〜（4代替Cu +）和Zn〜（2+）。通过对大块样品的电导率测量发现，通过部分取代Zr〜（4 +），Tc变得更高，并且在Zr〜（4+）含量为0.05的样品中表现出最大值。另一方面，Zn〜（2+）取代使Tc降低。这些结果表明，可以通过Zr和Zn取代来控制载流子浓度。实际上，通过螯合滴定确定的铜的平均价因这些取代而改变。在膜样品的情况下，也观察到类似的超导特性趋势。为了详细研究晶体结构，我们测量了中子衍射图，然后进行了Rietveld分析。结果，澄清了（Cu，Zr）-O_2层由于Zr取代而变得平坦。这种结构变化可能是取代改善超导性能的原因之一。

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