Obtaining tetragonal FeAs layer and superconducting KxFe2As2 by molecular beam epitaxy

Ding, Cui1,2; Li, Yuanzhao1; Ji, Shuaihua1; He, Ke1; Wang, Lili1,3; Xue, Qi-Kun1,2,4

2022-09-01

10.1007/s12274-022-4956-4

Nano Research   Impact Factor & Quartile

1998-0124

1998-0000

Atomic characterization on tetragonal FeAs layer and engineering FeAs superlattices is highly desirable to get deep insight into the multi-band superconductivity in iron-pnictides. We fabricate the tetragonal FeAs layer by topotactic reaction of FeTe films with arsenic and then obtain KxFe2As2 upon potassium intercalation using molecular beam epitaxy. The in-situ low-temperature scanning tunneling microscopy/spectroscopy investigations demonstrate characteristic root 2 x root 2 reconstruction of the FeAs layer and stripe pattern of KxFe2As2, accompanied by the development of a superconducting-like gap. The ex-situ transport measurement with FeTe capping layers shows a superconducting transition with an onset temperature of 10 K. This work provides a promising way to characterize the FeAs layer directly and explore rich emergent physics with epitaxial superlattice design.

tetragonal FeAs KxFe2As2 interface enhanced superconductivity topotactic reaction molecular beam epitaxy

SCI

English

Corresponding

National Natural Science Foundation of China["12074210","51788104","11790311","12141403"] ; Basic and Applied Basic Research Major Programme of Guangdong Province of China[2021B0301030003] ; Jihua Laboratory[X210141TL210]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000853447100006

TSINGHUA UNIV PRESS

Web of Science

1.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
3.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Ding, Cui,Li, Yuanzhao,Ji, Shuaihua,et al. Obtaining tetragonal FeAs layer and superconducting KxFe2As2 by molecular beam epitaxy[J]. Nano Research,2022.

Ding, Cui,Li, Yuanzhao,Ji, Shuaihua,He, Ke,Wang, Lili,&Xue, Qi-Kun.(2022).Obtaining tetragonal FeAs layer and superconducting KxFe2As2 by molecular beam epitaxy.Nano Research.

Ding, Cui,et al."Obtaining tetragonal FeAs layer and superconducting KxFe2As2 by molecular beam epitaxy".Nano Research (2022).