Ubiquitous strong electron-phonon coupling at the interface of FeSe/SrTiO3

被引：64

作者：

Zhang, Chaofan ^{[1
,2
,3
]}

Liu, Zhongkai ^{[4
]}

Chen, Zhuoyu ^{[1
,2
,3
]}

Xie, Yanwu ^{[1
,2
,3
]}

He, Ruihua ^{[5
]}

Tang, Shujie ^{[1
,2
,3
]}

He, Junfeng ^{[1
,2
,3
]}

Li, Wei ^{[1
,2
,3
]}

Jia, Tao ^{[1
,2
,3
]}

Rebec, Slavko N. ^{[1
,2
,3
]}

Ma, Eric Yue ^{[1
,2
,3
]}

Yan, Hao ^{[1
,2
,3
]}

Hashimoto, Makoto ^{[6
]}

Lu, Donghui ^{[6
]}

Mo, Sung-Kwan ^{[7
]}

Hikita, Yasuyuki ^{[1
]}

Moore, Robert G. ^{[1
,2
,3
]}

Hwang, Harold Y. ^{[1
,2
,3
]}

Lee, Dunghai ^{[8
]}

Shen, Zhixun ^{[1
,2
,3
]}

机构：

[1] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

[2] Stanford Univ, Geballe Lab Adv Mat, Dept Phys, Stanford, CA 94305 USA

[3] Stanford Univ, Geballe Lab Adv Mat, Dept Appl Phys, Stanford, CA 94305 USA

[4] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China

[5] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[6] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

[7] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

关键词：

PHASE-DIAGRAM; FESE; SUPERCONDUCTIVITY; SURFACE; GAS; LIQUID; LAYER;

D O I：

10.1038/ncomms14468

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：

The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe electrons and the STO phonons are responsible for the enhancement of T-c over other FeSe-based superconductors. However the recent observation of a similar superconducting gap in single-unit-cell FeSe/STO(110) raised the question of whether a similar mechanism applies. Here we report the ARPES study of the electronic structure of FeSe/STO(110). Similar to the results in FeSe/STO(001), clear replica bands are observed. We also present a comparative study of STO(001) and STO(110) bare surfaces, and observe similar replica bands separated by approximately the same energy, indicating this coupling is a generic feature of the STO surfaces and interfaces. Our findings suggest that the large superconducting gaps observed in FeSe films grown on different STO surface terminations are likely enhanced by a common mechanism.

引用

页数：6

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