Observation of high-Tc superconductivity in rectangular FeSe/SrTiO3(110) monolayers

被引：65
作者：
Zhang, P. [1 ,2 ]
Peng, X. -L. [1 ,2 ]
Qian, T. [1 ,2 ,3 ]
Richard, P. [1 ,2 ,3 ]
Shi, X. [1 ,2 ]
Ma, J. -Z. [1 ,2 ]
Fu, B. B. [1 ,2 ]
Guo, Y. -L. [1 ,2 ]
Han, Z. Q. [1 ,2 ,4 ]
Wang, S. C. [4 ]
Wang, L. L. [3 ,5 ]
Xue, Q. -K. [3 ,5 ]
Hu, J. P. [1 ,2 ,3 ,6 ]
Sun, Y. -J. [1 ,2 ]
Ding, H. [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China
[4] Renmin Univ, Dept Phys, Beijing 100872, Peoples R China
[5] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
[6] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 10期
关键词：
HIGH-TEMPERATURE SUPERCONDUCTIVITY; PHASE-DIAGRAM; THIN-FILMS; ELECTRONIC ORIGIN; FESE FILMS; STRAIN; ORDER;
D O I：
10.1103/PhysRevB.94.104510
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We design a monolayer film of FeSe on SrTiO3(110) substrate [FeSe/STO(110)], with a C-2 symmetry induced by epitaxial strain. Compared to FeSe on SrTiO3(001) substrate [FeSe/STO(001)], one of the in-plane lattice constants is reduced by 6%, to similar to 3.67 angstrom. FeSe/STO(110) exhibits a large nearly isotropic superconducting gap of 16 meV filled around 60 K, similar to those obtained on FeSe/STO(001) films. Our results strongly suggest that the lattice C-4 symmetry is not essential for reaching high T-c's in Fe-based superconductors and pose a new challenge to theory.
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页数：5
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