首页> 外文会议>Conference on High Temperature Superconductivity Coral Gables, Florida January 7-13 1999 >Decreasing superconductivity auppression of Pr in RE:123 compounds by isolating the same from Cu-O conduction band
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Decreasing superconductivity auppression of Pr in RE:123 compounds by isolating the same from Cu-O conduction band

机译:通过将其与Cu-O导带隔离来降低Pr:123化合物中Pr的超导抑制

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We present the results on structure, superconducting T_c, and magnetic ordering temperature of Pr moments of several Pr substituted rare earth (RE) oxide systems such as Y_(1-x)Pr_xBaSrCu_3O_7 (Y/PrBaSr:123), La(1-x)Pr_xCaCu_3O_7 (LaPrBaCa:123) and Nd(1-x)Pr_xBaCu_3O_7 (Nd/PrBaCa:123). We observe that the suppression of superconductivity due to Pr in all these systems is less in comparison to that in their RE:123 counterparts, i.e. in Pr substituted Y:123, La:123 and Nd:123, respectively. Interestingly with full Pr substitution in RE:123 compounds, the Pr moments order antiferromagnetically at 17K, while in the presently studied three systems, the same happens at around 10K only. Antiferromagnetic ordering temperature of the Pr moments of the end member of the series, which may be taken to be a measure of the strength of the hybridization of Pr-4f orbitals with Cu-O conduction band, appears to have a direct correlation with suppression of superconductivity in the corresponding series. Our results suggest that by various on-site substitutions or by modifying the parent unit cell of Pr:123 compound, one may be able to isolate the Pr-4f magnetic moments or decrease their interction with the Cu-O conduction band, and achieve superconductivity in the presence of Pr.
机译:我们介绍了一些结构上的结果,超导T_c和几种Pr替代稀土(RE)氧化物体系(例如Y_(1-x)Pr_xBaSrCu_3O_7(Y / PrBaSr:123),La(1-x)的Pr矩的磁有序温度的结果)Pr_xCaCu_3O_7(LaPrBaCa:123)和Nd(1-x)Pr_xBaCu_3O_7(Nd / PrBaCa:123)。我们观察到,与它们的RE:123对应物相比,在所有这些系统中,由于Pr引起的超导抑制作用都较小,即分别在Pr取代的Y:123,La:123和Nd:123中。有趣的是,在RE:123化合物中用完全Pr取代时,Pr矩在17K时反铁磁有序,而在目前研究的三个系统中,同样的情况仅在10K左右发生。该系列末端成员的Pr矩的反铁磁有序温度,可以用来衡量Pr-4f轨道与Cu-O导带的杂化强度,似乎与抑制Pb-4f具有直接关系。相应系列中的超导。我们的结果表明,通过各种现场取代或修饰Pr:123化合物的母体晶胞,人们可能能够分离Pr-4f磁矩或减少其与Cu-O导带的交汇,并实现超导性在Pr。的存在下

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