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Superheating and melting mechanisms of YBa2Cu3O7-x surfaces
Huang, Simin1,2; Chen, Yuanyuan1,2; Yao, Xin1,2; Jin, Zhaohui3,4
Corresponding AuthorYao, Xin(xyao@sjtu.edu.cn) ; Jin, Zhaohui(zhjin@imr.ac.cn)
2021-03-14
Source PublicationJOURNAL OF APPLIED PHYSICS
ISSN0021-8979
Volume129Issue:10Pages:10
AbstractRecently, 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.
Funding OrganizationKey Projects for Research & Development of China ; Shanghai talent program
DOI10.1063/5.0033084
Indexed BySCI
Languageen
Funding ProjectKey Projects for Research & Development of China[2016YFA0300403] ; Shanghai talent program
WOS Research AreaPhysics
WOS SubjectPhysics, Applied
WOS IDWOS:000630451000002
PublisherAMER INST PHYSICS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161400
Collection中国科学院金属研究所
Corresponding AuthorYao, Xin; Jin, Zhaohui
Affiliation1.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
Recommended Citation
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.
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