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

The observation of replica bands in single-unit-cell FeSe on SrTiO 3 (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...

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Veröffentlicht in:Nature communications 2017-02, Vol.8 (1), p.14468-14468, Article 14468
Hauptverfasser: Zhang, Chaofan, Liu, Zhongkai, Chen, Zhuoyu, Xie, Yanwu, He, Ruihua, Tang, Shujie, He, Junfeng, Li, Wei, Jia, Tao, Rebec, Slavko N., Ma, Eric Yue, Yan, Hao, Hashimoto, Makoto, Lu, Donghui, Mo, Sung-Kwan, Hikita, Yasuyuki, Moore, Robert G., Hwang, Harold Y., Lee, Dunghai, Shen, Zhixun
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Sprache:eng
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Zusammenfassung:The observation of replica bands in single-unit-cell FeSe on SrTiO 3 (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. Whether electron–phonon coupling is a generic feature in FeSe/SrTiO 3 to enhance superconductivity remains unclear. Here, Zhang et al . report replica bands in FeSe/SrTiO 3 (110), suggesting a common mechanism in FeSe on SrTiO 3 with different surface terminations.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms14468