High-temperature superconductivity at the FeSe/SrTiO[subscript 3] interface
Name
Xiang-2012-High-temperature superconductivity at the.pdf
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Author(s)
Xiang, Yuan-Yuan
Wang, Fa
Wang, Da
Wang, Qiang-Hua
Lee, Dung-Hai
Date Issued
October 2012
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.86.134508
