Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3

Jian Feng Ge, Zhi Long Liu, Canhua Liu, Chun Lei Gao, Dong Qian, Qi Kun Xue, Ying Liu, Jin Feng Jia

Research output: Contribution to journalArticle

622 Scopus citations

Abstract

Recent experiments on FeSe films grown on SrTiO3 (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (Tc) of up to 80 K (ref.). This is nearly ten times the Tc of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs,), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance - the key experimental signature of superconductivity - only below 30 K. Here, we report the observation of superconductivity with Tc above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-Tc superconductivity.

Original languageEnglish (US)
Pages (from-to)285-289
Number of pages5
JournalNature Materials
Volume14
Issue number3
DOIs
StatePublished - Mar 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Ge, J. F., Liu, Z. L., Liu, C., Gao, C. L., Qian, D., Xue, Q. K., Liu, Y., & Jia, J. F. (2015). Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3. Nature Materials, 14(3), 285-289. https://doi.org/10.1038/nmat4153