Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.067002
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Funding
- U.S. Department of Energy, Office of Sciences, Basic Energy Sciences, Materials Sciences and Engineering Division
- Air Force Office of Scientific Research
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To elucidate the mechanisms behind the enhanced T-c in monolayer (1 ML) FeSe on SrTiO3 (STO), we grew highly strained 1 ML FeSe on the rectangular (100) face of rutile TiO2, and observed the coexistence of replica bands and superconductivity with a T-c of 63 K. From the similar T-c between this system and 1ML FeSe on STO (001), we conclude that strain and dielectric constant are likely unimportant to the enhanced T-c in these systems. A systematic comparison of 1 ML FeSe on TiO2 with other systems in the FeSe family shows that while charge transfer alone can enhance T-c, it is only with the addition of interfacial electron-phonon coupling that T-c can be increased to the level seen in 1 ML FeSe on STO.
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