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Layer-Stacking, Defects, and Robust Superconductivity on the Mo-Terminated Surface of Ultrathin Mo2C Flakes Grown by CVD
Zhang, Zongyuan; Gedeon, Habakubaho; Cheng, Zhengwang; Xu, Chuan; Shao, Zhibin; Sun, Haigen; Li, Shaojian; Cao, Yan; Zhang, Xin; Bian, Qi; Liu, Lijun; Liu, Zhibo; Cheng, Hui-Ming; Ren, Wencai; Pan, Minghu
2019-05-01
Source PublicationNANO LETTERS
ISSN1530-6984
Volume19Issue:5Pages:3327-3335
AbstractMaterials can exhibit exotic properties when they approach the two-dimensional (2D) limit. Because of promising applications in catalysis and energy storage, 2D transition-metal carbides (TMCs) have attracted considerable attention in recent years. Among these TMCs, ultrathin crystalline alpha-Mo2C flakes have been fabricated by chemical vapor deposition on Cu/Mo bilayer foils, and their 2D superconducting property was revealed by transport measurements. Herein, we studied the ultrathin alpha-Mo2C flakes by atomic-resolved scanning tunneling microscopy/spectroscopy (STM/S). Strain-related structural modulation and the coexistence of different layer-stacking modes are observed on the Mo-terminated surface of alpha-Mo2C flakes as well as various lattice defects. Furthermore, an enhanced superconductivity with shorter correlation length was observed by STS technique, and such superconductivity is very robust despite the appearance of the defects. A mechanism of superconducting enhancement is proposed based on the strain-induced strong coupling and the increased disordering originated from lattice defects. Our results provide a comprehensive understanding of the correlations between atomic structure, defects, and enhanced superconductivity of this emerging 2D material.
KeywordUltrathin alpha-Mo2C flakes scanning tunneling microscopy/spectroscopy layer stacking structural defects superconductivity
Indexed BySCI
Language英语
WOS IDWOS:000467781900072
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81130
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Zhang, Zongyuan,Gedeon, Habakubaho,Cheng, Zhengwang,et al. Layer-Stacking, Defects, and Robust Superconductivity on the Mo-Terminated Surface of Ultrathin Mo2C Flakes Grown by CVD[J]. NANO LETTERS,2019,19(5):3327-3335.
APA Zhang, Zongyuan.,Gedeon, Habakubaho.,Cheng, Zhengwang.,Xu, Chuan.,Shao, Zhibin.,...&Pan, Minghu.(2019).Layer-Stacking, Defects, and Robust Superconductivity on the Mo-Terminated Surface of Ultrathin Mo2C Flakes Grown by CVD.NANO LETTERS,19(5),3327-3335.
MLA Zhang, Zongyuan,et al."Layer-Stacking, Defects, and Robust Superconductivity on the Mo-Terminated Surface of Ultrathin Mo2C Flakes Grown by CVD".NANO LETTERS 19.5(2019):3327-3335.
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