arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.08526cond-mat.supr-con
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LaAlO3/KTaO3(110)异质界面二维超导电性的观察

Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface

Zheng Chen, Zhongran Liu, Yanqiu Sun, Xiaoxin Chen, Yuan Liu, Hui Zhang, Hekang Li, Meng Zhang, Siyuan Hong, Tianshuang Ren, Chao Zhang, He Tian, Yi Zhou, Jirong Sun, Yanwu Xie

摘要:

本文报道了在LaAlO_3薄膜与5d过渡金属氧化物KTaO_3(110)单晶的界面上观察到Tc ~ 0.9K的超导电性。界面上的上临界场表现出很大的各向异性,其超导转变是符合Berezinskiii-Kosterlitz-Alkyless转变。这两个事实表明,超导性是二维(2D)的性质。在5 K时测得的载流子密度约为10^13 cm-2的7倍。超导层厚度和相干长度分别估计为~8和~30 nm。我们的结果为二维氧化物界面超导电性的研究提供了一个新的平台。

英文摘要:

We report on the observation of a Tc ~0.9 K superconductivity at the interface between LaAlO3 film and the 5d transition-metal oxide KTaO3(110) single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is ~7 time 10^13 cm-2. The superconducting layer thickness and coherence length are estimated to be ~8 and ~30 nm, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

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。

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