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 |
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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. |
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ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/ncomms14468 |