Unveiling high-Tc superconductivity: probing CuO2 planes in infinite-layer cuprates

Rui-Feng Wang, Can-Li Song, Xu-Cun Ma, Qi-Kun Xue
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引用次数: 0

Abstract

The quest to unravel the intricacies of high-Tc superconductivity and strongly correlated electrons in cuprates has spurred a novel focus on direct probing of the CuO2 planes through scanning tunneling microscopy. Infinite-layer (IL) cuprates, featuring a CuO2-terminated surface, emerge as optimal systems for this investigation. Leveraging controllable growth via molecular beam epitaxy, both electron- and hole-doped IL cuprates are realized, with surface structure and c-axis length serving as distinctive markers. A consistent pattern in the Mott transition is established, revealing that doping merely shifts the Fermi level without inducing changes in the Mott band structure, thereby suggesting a self-modulation doping scenario. Furthermore, the identification of a nodeless superconducting gap in the CuO2 planes challenges conventional notions derived from charge reservoir layers, advocating for a quantum well interpretation of cuprate superconductivity. This review sheds light on the distinct roles played by CuO2 layers and charge reservoir layers, promising a more profound comprehension of cuprate superconductivity through the lens of the CuO2 surface.

揭示高tc超导性:探测无限层铜酸盐中的CuO2平面
为了解开铜酸盐中高tc超导性和强相关电子的复杂性,人们开始关注通过扫描隧道显微镜直接探测CuO2平面。无限层(IL)铜酸盐具有cuo2末端表面,是本研究的最佳系统。利用分子束外延的可控生长,实现了电子和空穴掺杂的IL铜酸盐,其表面结构和c轴长度作为独特的标记。在Mott跃迁中建立了一个一致的模式,揭示了掺杂仅仅改变了费米能级而没有引起Mott能带结构的变化,从而提出了自调制掺杂的场景。此外,CuO2平面中无节点超导间隙的识别挑战了来自电荷储层的传统概念,倡导铜超导的量子阱解释。本文综述了CuO2层和电荷储层的不同作用,有望通过CuO2表面的透镜更深刻地理解铜的超导性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
8.20
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