High-temperature superconductivity at the FeSe/SrTiO[subscript 3] interface
Author(s)
Xiang, Yuan-Yuan; Wang, Fa; Wang, Da; Wang, Qiang-Hua; Lee, Dung-Hai
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In several recent experiments the superconducting gap of a single-unit-cell-thick FeSe film on SrTiO[subscript 3] substrate has been observed by scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. The value of the superconducting gap is about nine times larger than that of the bulk FeSe under ambient pressure, suggesting a much higher pairing energy scale and T[subscript c] than all other iron-based superconductors and thus calling for a better understanding of its superconducting mechanism. In this paper we study the effects of screening due to the SrTiO[subscript 3] ferroelectric phonons on Cooper pairing in FeSe. We conclude that it can significantly enhance the energy scale of Cooper pairing and even change the pairing symmetry. Our results also raise some concerns on whether phonons can be completely ignored for bulk iron-based superconductors.
Date issued
2012-10Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review B
Publisher
American Physical Society
Citation
Xiang, Yuan-Yuan et al. “High-temperature superconductivity at the FeSe/SrTiO[subscript 3] interface.” Physical Review B 86.13 (2012): n. pag. Web. 7 Jan. 2013.
Version: Final published version
ISSN
1098-0121
1550-235X