Recurrence of superconductivity in thickness-gradient La1.81Ce0.19CuO4−δ film

IF 3.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Physical Review Materials Pub Date : 2024-09-09 DOI:10.1103/physrevmaterials.8.094801

Sijia Tu, Jinsong Zhang, Zefeng Lin, Beiyi Zhu, Qihong Chen, Jie Yuan, Kui Jin

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Abstract

We report a systematic study of the thickness effect on the superconductivity of overdoped

L a_{2 - x} C e_{x} Cu O_{4 - δ}

films. As the film thickness decreases, a recurrence of superconductivity is observed in the

x = 0.19

film, while this doping level is commonly expected to show Fermi liquid behavior. The superconducting critical temperatures exhibit a domelike shape with varying thickness. The magnetic susceptibility measurements suggest that the presence of superconductivity in thin films should be filamentary. The combined effect of stress and oxygen in the thickness-gradient films is proposed to comprehend the experimental observations. Our findings provide new perspectives on superconductivity in other systems, such as the hotly debated nickelate superconductors.

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厚度梯度 La1.81Ce0.19CuO4-δ 薄膜中超导性的复现

我们报告了一项关于厚度对过度掺杂的 La2-xCexCuO4-δ 薄膜超导性影响的系统研究。随着薄膜厚度的减小，在 x=0.19 薄膜中观察到了超导电性的复现，而这一掺杂水平通常被认为会表现出费米液体行为。随着厚度的变化，超导临界温度呈现圆球状。磁感应强度测量结果表明，薄膜中的超导现象应该是丝状的。我们提出了厚度梯度薄膜中应力和氧的共同作用来理解实验观察结果。我们的发现为其他系统中的超导现象提供了新的视角，例如备受争议的镍酸盐超导体。

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来源期刊

Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)

CiteScore

5.80

自引率

5.90%

发文量

611

期刊介绍： Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.