共 50 条
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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