Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO3

被引:25
|
作者
Peng, Rui [1 ,2 ,3 ]
Zou, Ke [1 ,2 ,8 ,9 ]
Han, M. G. [4 ]
Albright, Stephen D. [2 ,5 ]
Hong, Hawoong [6 ]
Lau, Claudia [2 ,5 ]
Xu, H. C. [1 ,2 ,3 ]
Zhu, Yimei [4 ]
Walker, F. J. [1 ,2 ]
Ahn, C. H. [1 ,2 ,5 ,7 ]
机构
[1] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA
[2] Yale Univ, Ctr Res Interface Struct & Phenomena, New Haven, CT 06520 USA
[3] Fudan Univ, Lab Adv Mat, Shanghai 200433, Peoples R China
[4] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA
[5] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[7] Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06520 USA
[8] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[9] Univ British Columbia, Stewart Blusson Quantum Matter Inst, Vancouver, BC V6T 1Z1, Canada
关键词
HIGH-TEMPERATURE SUPERCONDUCTIVITY; SURFACE-STRUCTURES; PHASE-CONTRAST; FESE FILMS; 65; K; T-C; SRTIO3; STEM;
D O I
10.1126/sciadv.aay4517
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Remarkable enhancement of the superconducting transition temperature (T-c) has been observed for monolayer (ML) FeSe films grown on SrTiO3 substrates. The atomic-scale structure of the FeSe/SrTiO3 interface is an important determinant of both the magnetic and interfacial electron-phonon interactions and is a key ingredient to understanding its high-T-c superconductivity. We resolve the atomic-scale structure of the FeSe/SrTiO3 interface through a complementary analysis of scanning transmission electron microscopy and in situ surface x-ray diffraction. We find that the interface is more strongly bonded for a particular registration, which leads to a coherently strained ML. We also determine structural parameters, such as the distance between ML FeSe and the oxide, Se-Fe-Se bond angles, layer-resolved distances between Fe-Se, and registry of the FeSe lattice relative to the oxide. This picoscale structure determination provides an explicit structural framework and constraint for theoretical approaches addressing the high-T-c mechanism in FeSe/SrTiO3.
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页数:7
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