High $T_c$ superconductivity at the FeSe/SrTiO$_3$ Interface

Fa Wang; Yuan-Yuan Xiang; Da Wang; Qiang-Hua Wang; Dung-Hai Lee

High $T_c$ superconductivity at the FeSe/SrTiO$_3$ Interface

Superconductivity 2012-10-09 v2 Strongly Correlated Electrons

Authors: Fa Wang , Yuan-Yuan Xiang , Da Wang , Qiang-Hua Wang , Dung-Hai Lee

Abstract

In a recent experiment the superconducting gap of a single unit cell thick FeSe film on SrTiO $_3$ substrate is observed by scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. The value of the superconducting gap is much larger than that of the bulk FeSe under ambient pressure. In this paper we study the effects of screening due to the ferroelectric phonons on Cooper pairing. We conclude 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.

Keywords

cooper pair superconductivity iron-based superconductor superconductivity

Cite

@article{arxiv.1202.4141,
  title  = {High $T_c$ superconductivity at the FeSe/SrTiO$_3$ Interface},
  author = {Fa Wang and Yuan-Yuan Xiang and Da Wang and Qiang-Hua Wang and Dung-Hai Lee},
  journal= {arXiv preprint arXiv:1202.4141},
  year   = {2012}
}

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20 one-column pages with appendix, 9 figures

High $T_c$ superconductivity at the FeSe/SrTiO$_3$ Interface

Abstract

Keywords

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