Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β -Mo 2 C crystal sheets

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	Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β -Mo 2 C crystal sheets
	Yunjie Fan 1; Chuan Xu 2; Xiang Liu 1; Chao Ma 1; Yuewei Yin 1; Hui-Ming Cheng 2; Wencai Ren 2; Xiaoguang Li 1
	2020
发表期刊	NPG Asia Materials
ISSN	1884-4049
摘要	Recently, 2D Mo 2 C, a new member of the MXene family, has attracted much attention due to the exotic superconducting properties discovered in 2D α -Mo 2 C. Here, not only 2D α -Mo 2 C but also 2D β -Mo 2 C crystal sheets with distinct disordered carbon distributions were successfully grown. 2D β -Mo 2 C shows a much stronger superconductivity than 2D α -Mo 2 C, and their superconductivities have different hydrostatic pressure responses. The superconducting transition temperature T c of 2D α -Mo 2 C shows a dome-shaped profile under pressure, implying the existence of two competing effects arising from phononic and electronic properties, while for 2D β -Mo 2 C, T c decreases monotonically with increasing pressure, possibly due to phonon stiffening. These results indicate that the electronic properties have a more important influence on the superconductivity in 2D α -Mo 2 C compared to 2D β -Mo 2 C. The ordered and disordered carbon distributions in 2D α -Mo 2 C and β -Mo 2 C, respectively, may be the underlying origin for their different electronic and superconducting properties.
语种	英语
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/124241
专题	中国科学院合肥物质科学研究院
作者单位	1.中国科学技术大学 2.Institute of Metal Research, Chinese Academy of Sciences 3.中国科学院固体物理研究所 4.Collaborative Innovation Center of Advanced Microstructures
推荐引用方式 GB/T 7714	Yunjie Fan,Chuan Xu,Xiang Liu,et al. Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β -Mo 2 C crystal sheets[J]. NPG Asia Materials,2020,12.
APA	Yunjie Fan.,Chuan Xu.,Xiang Liu.,Chao Ma.,Yuewei Yin.,...&Xiaoguang Li.(2020).Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β -Mo 2 C crystal sheets.NPG Asia Materials,12.
MLA	Yunjie Fan,et al."Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β -Mo 2 C crystal sheets".NPG Asia Materials 12(2020).