Defect and interlayer coupling tuned quasiparticle scattering in 2D disordered Mo2C superconducting microcrystals

doi:10.1088/1361-6463/aba067

IMR OpenIR

	Defect and interlayer coupling tuned quasiparticle scattering in 2D disordered Mo2C superconducting microcrystals
	Gedeon,Habakubaho 1; Zhang,Zongyuan 1; Shao,Zhibin 1; Xu,Chuan 2; Sun,Haigen 1; Li,Shaojian 1; Cao,Yan 1; Cheng,Zhengwang 1; Zhang,Xin 1; Bian,Qi 1; Liu,Zhibo 2; Cheng,Hui-Ming 2,3,4; Ren,Wencai 2,3; Pan,Minghu 1
通讯作者	Ren,Wencai() ; Pan,Minghu()
	2020-07-31
发表期刊	Journal of Physics D: Applied Physics
ISSN	0022-3727
卷号	53 期号:43
摘要	AbstractRecently, two-dimensional (2D) materials have exhibited many exotic properties, such as topological bands, superconductivity, etc. Among these intriguing systems, interface engineering plays a critical role in inducing, manipulating and even enhancing the properties. Our scanning tunneling microscopic/spectroscopic (STM/S) analysis of 2D superconducting thin α-Mo2C crystal has previously revealed the enhanced TC = 8.02 K originating from the lattice defects. With the same TC, here we demonstrate that the scattering mechanism leads to a more consistent picture to understand the superconductivity in a defected crystal, which can be tuned by interlayer coupling. Using a low-temperature STM, dI/dV spectra were fitted with the Dynes formula to extract the quasiparticle scattering rates at various temperatures. Moreover, the STS analysis of defective sample surfaces and terraces reveals that both quasiparticle scattering rates and zero-bias conductance oscillate as a result of interlayer coupling variation. A temperature-dependent model considering elastic, electron–electron, and electron–phonon inelastic scattering rates was used to fit excellently the quasiparticle scattering rates measured along defects and terraces. The electron–electron scattering rate exhibits a negative fitting parameter, indicating the loss of inelastic electron–electron scattering rate. Additionally, the elastic scattering rate is much higher than the total inelastic scattering rate, which is an indication of the retarded quasiparticle interactions with impurities.
关键词	α-Mo2C crystals disorder elastic and inelastic scattering rates retarded interactions STM/S
DOI	10.1088/1361-6463/aba067
语种	英语
WOS记录号	IOP:0022-3727-53-43-aba067
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/80673
专题	中国科学院金属研究所
通讯作者	Ren,Wencai; Pan,Minghu
作者单位	1.School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China 2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China 3.School of Material Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China 4.Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, 1001 Xueyuan Road, Shenzhen 518055, People’s Republic of China
推荐引用方式 GB/T 7714	Gedeon,Habakubaho,Zhang,Zongyuan,Shao,Zhibin,et al. Defect and interlayer coupling tuned quasiparticle scattering in 2D disordered Mo2C superconducting microcrystals[J]. Journal of Physics D: Applied Physics,2020,53(43).
APA	Gedeon,Habakubaho.,Zhang,Zongyuan.,Shao,Zhibin.,Xu,Chuan.,Sun,Haigen.,...&Pan,Minghu.(2020).Defect and interlayer coupling tuned quasiparticle scattering in 2D disordered Mo2C superconducting microcrystals.Journal of Physics D: Applied Physics,53(43).
MLA	Gedeon,Habakubaho,et al."Defect and interlayer coupling tuned quasiparticle scattering in 2D disordered Mo2C superconducting microcrystals".Journal of Physics D: Applied Physics 53.43(2020).