Multi-conditioned controlled growth of CoBi nanostructures on SrTiO3

IF 6.5 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Frontiers of Physics Pub Date : 2024-07-17 DOI:10.1007/s11467-024-1423-6

Desheng Cai, Yumin Xia, Pengju Li, Kun Xie, Yuzhou Liu, Yitong Gu, Gan Yu, Changgan Zeng, Ping Cui, Shengyong Qin

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引用次数: 0

Abstract

Cobalt pnictides have been theoretically proposed to be attractive candidates for high-temperature superconductors. Additionally, monolayered CoX (X = As, Sb, Bi) on SrTiO₃ systems present a potential new platform for realizing topological superconductors in the two-dimensional limit, due to their nontrivial band topology. To this end, we have successfully fabricated high-quality CoBi nanoislands on SrTiO₃ (001) substrates by molecular beam epitaxy followed by an investigation of their atomic structure and electronic properties via in situ scanning tunneling microscopy/spectroscopy. Beyond the previously predicted lattice with a = b = 3.5 Å, 2 × 1 dimer row was observed in this study. Furthermore, our results reveal that the topography of CoBi islands is strongly influenced by various growth conditions, such as substrate temperature, the flux ratio between Co and Bi, and the annealing process. This study paves the way for further explorations of the superconductivity and topological properties of cobalt pnictide systems.

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钴铋纳米结构在 SrTiO3 上的多条件受控生长

从理论上讲，铌钴化物是具有吸引力的高温超导体候选材料。此外，SrTiO3 系统上的单层 CoX（X = As、Sb、Bi）由于其非三维带拓扑结构，为实现二维极限拓扑超导体提供了一个潜在的新平台。为此，我们通过分子束外延技术在 SrTiO3 (001) 基底上成功制备了高质量的 CoBi 纳米岛，并通过原位扫描隧道显微镜/光谱仪对其原子结构和电子特性进行了研究。除了先前预测的 a = b = 3.5 Å 晶格外，本研究还观察到 2 × 1 二聚体行。此外，我们的研究结果表明，钴铋岛的形貌受到各种生长条件的强烈影响，如衬底温度、钴和铋之间的通量比以及退火过程。这项研究为进一步探索锑化钴系统的超导和拓扑特性铺平了道路。

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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来源期刊

Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-

CiteScore

9.20

自引率

9.30%

发文量

898

审稿时长

6-12 weeks

期刊介绍： Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.