Superheating and melting mechanisms of YBa2Cu3O7-x surfaces

doi:10.1063/5.0033084

CORC > 金属研究所 > 中国科学院金属研究所

	Superheating and melting mechanisms of YBa2Cu3O7-x surfaces
	Huang, Simin 1,2; Chen, Yuanyuan 1,2; Yao, Xin 1,2; Jin, Zhaohui 3,4
刊名	JOURNAL OF APPLIED PHYSICS
	2021-03-14
卷号	129 期号:10 页码:10
ISSN号	0021-8979
DOI	10.1063/5.0033084
通讯作者	Yao, Xin(xyao@sjtu.edu.cn) ; Jin, Zhaohui(zhjin@imr.ac.cn)
英文摘要	Recently, REBa2Cu3O7-x films were observed to possess excellent superheating performances, among which YBa2Cu3O7-x films deposited on LaAlO3 substrates could be superheated beyond the equilibrium melting point by 100K. Although previous investigations have shown that the low surface energy of this multilayered structure is responsible for the superheating nature, micro-mechanism remains unclear. Here, based on molecular dynamics simulations, the superheating origin of YBa2Cu3O7-x was studied at the atomic scale. We found that the (001) free surface possesses strong superheating capability and exhibits a layer-by-layer melting mode with a flat melting front. Remarkably, the superheating phenomenon is attributed to the high stability of Ba-O layers, which serve as obstacles in suppressing the melting propagation. In contrast, with an absence of such significant barriers, the (100) surface displays a wavy melting front and a continuous melting process. Particularly, in that case, the highly mobile oxygen atoms facilitate the penetration of the melting liquid phase into the bulk, which further deteriorate the film thermal stability. Moreover, we proposed a modified thermodynamic model to describe the concrete melting process. The atomic simulations provide detailed evidence for understanding the microscopic origin of the melting of YBa2Cu3O7-x films and hint the way to enhance the thermal stability of functional oxides with multilayer structures.
资助项目	Key Projects for Research & Development of China[2016YFA0300403] ; Shanghai talent program
WOS研究方向	Physics
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000630451000002
资助机构	Key Projects for Research & Development of China ; Shanghai talent program
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/161396]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yao, Xin; Jin, Zhaohui
作者单位	1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Minist Educ, Key Lab Artificial Struct & Quantum, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, Sch Phys & Astron, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China 3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Huang, Simin,Chen, Yuanyuan,Yao, Xin,et al. Superheating and melting mechanisms of YBa2Cu3O7-x surfaces[J]. JOURNAL OF APPLIED PHYSICS,2021,129(10):10.
APA	Huang, Simin,Chen, Yuanyuan,Yao, Xin,&Jin, Zhaohui.(2021).Superheating and melting mechanisms of YBa2Cu3O7-x surfaces.JOURNAL OF APPLIED PHYSICS,129(10),10.
MLA	Huang, Simin,et al."Superheating and melting mechanisms of YBa2Cu3O7-x surfaces".JOURNAL OF APPLIED PHYSICS 129.10(2021):10.