Tuning the band structure and superconductivity in single-layer FeSe by interface engineering

R. Peng, H. C. Xu, S. Y. Tan, H. Y. Cao, M. Xia, X. P. Shen, Z. C. Huang, C.H.P. Wen, Q. Song, T. Zhang, B. P. Xie, X. G. Gong and D. L. Feng ()
Additional contact information
R. Peng: State Key Laboratory of Surface Physics, Fudan University
H. C. Xu: State Key Laboratory of Surface Physics, Fudan University
S. Y. Tan: State Key Laboratory of Surface Physics, Fudan University
H. Y. Cao: State Key Laboratory of Surface Physics, Fudan University
M. Xia: State Key Laboratory of Surface Physics, Fudan University
X. P. Shen: State Key Laboratory of Surface Physics, Fudan University
Z. C. Huang: State Key Laboratory of Surface Physics, Fudan University
C.H.P. Wen: State Key Laboratory of Surface Physics, Fudan University
Q. Song: State Key Laboratory of Surface Physics, Fudan University
T. Zhang: State Key Laboratory of Surface Physics, Fudan University
B. P. Xie: State Key Laboratory of Surface Physics, Fudan University
X. G. Gong: State Key Laboratory of Surface Physics, Fudan University
D. L. Feng: State Key Laboratory of Surface Physics, Fudan University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The interface between transition metal compounds provides a rich playground for emergent phenomena. Recently, significantly enhanced superconductivity has been reported for single-layer FeSe on Nb-doped SrTiO3 substrate. Yet it remains mysterious how the interface affects the superconductivity. Here we use in situ angle-resolved photoemission spectroscopy to investigate various FeSe-based heterostructures grown by molecular beam epitaxy, and uncover that electronic correlations and superconducting gap-closing temperature (Tg) are tuned by interfacial effects. Tg up to 75 K is observed in extremely tensile-strained single-layer FeSe on Nb-doped BaTiO3, which sets a record high pairing temperature for both Fe-based superconductor and monolayer-thick films, providing a promising prospect on realizing more cost-effective superconducting device. Moreover, our results exclude the direct correlation between superconductivity and tensile strain or the energy of an interfacial phonon mode, and highlight the critical and non-trivial role of FeSe/oxide interface on the high Tg, which provides new clues for understanding its origin.

Date: 2014
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DOI: 10.1038/ncomms6044

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