arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1707.09360cond-mat.supr-concond-mat.str-el
收藏

电子掺杂高温超导体中的新电子态与超导电性

Novel Electronic State and Superconductivity in the Electron-Doped High-Tc T'-Superconductors

T. Adachi, T. Kawamata, Y. Koike

摘要:

在这篇综述文章中,我们展示了我们最近的结果有关的电子掺杂的高Tc铜氧化物与所谓的T'结构的未掺杂(无Ce)的超导电性。在引言部分,我们简要介绍了电子掺杂T ′-铜氧化物的特性,包括还原退火、常规相图和非掺杂超导电性。然后,我们的运输和磁性的结果和结果有关的超导配对对称性的未掺杂和欠掺杂的T '-铜酸盐。合作光谱和核磁共振结果也简要显示。已经发现,通过还原退火,在生长的样品中伴随着反铁磁赝能隙的载流子的强局域化状态在还原的超导样品中改变为具有短程磁序的金属和超导状态。在还原超导样品中由于极少量的过量氧而形成短程磁有序表明,母体化合物中表现出非掺杂超导性的T '-铜氧化物与空穴掺杂的高Tc铜氧化物一样,被认为是强关联电子系统。我们展示了我们提出的电子结构模型来理解未掺杂的超导电性。最后,对今后T ′-铜酸盐的研究方向进行了展望。

英文摘要:

In this review article, we show our recent results relating to the undoped (Ce-free) superconductivity in the electron-doped high-Tc cuprates with the so-called T' structure. For an introduction, we briefly mention the characteristics of the electron-doped T'-cuprates, including the reduction annealing, conventional phase diagram and undoped superconductivity. Then, our transport and magnetic results and results relating to the superconducting pairing symmetry of the undoped and underdoped T'-cuprates are shown. Collaborating spectroscopic and nuclear magnetic resonance results are also shown briefly. It has been found that, through the reduction annealing, a strongly localized state of carriers accompanied by an antiferromagnetic pseudogap in the as-grown samples changes to a metallic and superconducting state with a short-range magnetic order in the reduced superconducting samples. The formation of the short-range magnetic order due to a very small amount of excess oxygen in the reduced superconducting samples suggests that the T'-cuprates exhibiting the undoped superconductivity in the parent compounds are regarded as strongly correlated electron systems, as well as the hole-doped high-Tc cuprates. We show our proposed electronic structure model to understand the undoped superconductivity. Finally, unsolved future issues of the T'-cuprates are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑