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Charge Density Wave Orders and Enhanced Superconductivity under Pressure in the Kagome Metal CsV3Sb5
Advanced Materials ( IF 29.4 ) Pub Date : 2021-09-03 , DOI: 10.1002/adma.202102813
Qi Wang 1, 2 , Pengfei Kong 1 , Wujun Shi 1, 3, 4 , Cuiying Pei 1 , Chenhaoping Wen 1 , Lingling Gao 1 , Yi Zhao 1 , Qiangwei Yin 5 , Yueshen Wu 1 , Gang Li 1, 2 , Hechang Lei 5 , Jun Li 1, 2 , Yulin Chen 1, 2, 6 , Shichao Yan 1, 2 , Yanpeng Qi 1
Affiliation  

Superconductivity in topological kagome metals has recently received great research interests. Here, charge density wave (CDW) orders and the evolution of superconductivity under various pressures in CsV3Sb5 single crystal with V kagome lattice are investigated. By using high-resolution scanning tunneling microscopy/spectroscopy (STM/STS), two CDW orders in CsV3Sb5 are observed which correspond to 4a × 1a and 2a × 2a superlattices. By applying pressure, the superconducting transition temperature Tc is significantly enhanced and reaches a maximum value of 8.2 K at around 1 GPa. Accordingly, CDW state is gradually declined as increasing the pressure, which indicates the competing interplay between CDW and superconducting state in this material. The broad superconducting transitions around 0.4–0.8 GPa can be related to the strong competition relation among two CDW states and superconductivity. These results demonstrate that CsV3Sb5 is a new platform for exploring the interplay between superconductivity and CDW in topological kagome metals.

中文翻译:

Kagome 金属 CsV3Sb5 在压力下的电荷密度波阶和增强的超导性

拓扑 Kagome 金属中的超导性最近受到了极大的研究兴趣。在这里,研究了具有 V kagome 晶格的CsV 3 Sb 5单晶在各种压力下的电荷密度波 (CDW) 阶和超导性的演变。通过使用高分辨率扫描隧道显微镜/光谱法 (STM/STS),观察到CsV 3 Sb 5中的两个 CDW 阶,它们对应于 4 a  × 1 a和 2 a  × 2 a超晶格。通过施加压力,超导转变温度T c显着增强,并在 1 GPa 左右达到最大值 8.2 K。因此,CDW 状态随着压力的增加而逐渐下降,这表明该材料中 CDW 和超导状态之间存在竞争性相互作用。0.4-0.8 GPa 附近的宽超导跃迁可能与两种 CDW 态和超导性之间的强竞争关系有关。这些结果表明,CsV 3 Sb 5是探索拓扑kagome 金属中超导性和CDW 之间相互作用的新平台。
更新日期:2021-10-20
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