Coexistence of Replica Bands and Superconductivity in FeSe Monolayer Films

S. N. Rebec; T. Jia; C. Zhang; M. Hashimoto; D. H. Lu; R. G. Moore; Z. X. Shen

doi:10.1103/PhysRevLett.118.067002

Coexistence of Replica Bands and Superconductivity in FeSe Monolayer Films

S. N. Rebec, T. Jia, C. Zhang, M. Hashimoto, D. H. Lu, R. G. Moore, Z. X. Shen

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Abstract

To elucidate the mechanisms behind the enhanced Tc 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 Tc of 63 K. From the similar Tc between this system and 1ML FeSe on STO (001), we conclude that strain and dielectric constant are likely unimportant to the enhanced Tc 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 Tc, it is only with the addition of interfacial electron-phonon coupling that Tc can be increased to the level seen in 1 ML FeSe on STO.

Original language	English
Article number	067002
Journal	Physical Review Letters
Volume	118
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.118.067002
State	Published - Feb 10 2017
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy, Office of Sciences, Basic Energy Sciences, Materials Sciences and Engineering Division and also by the Air Force Office of Scientific Research. ARPES measurements were performed at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.

Funders	Funder number
U.S. Department of Energy
Air Force Office of Scientific Research
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

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abstract = "To elucidate the mechanisms behind the enhanced Tc 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 Tc of 63 K. From the similar Tc between this system and 1ML FeSe on STO (001), we conclude that strain and dielectric constant are likely unimportant to the enhanced Tc 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 Tc, it is only with the addition of interfacial electron-phonon coupling that Tc can be increased to the level seen in 1 ML FeSe on STO.",

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AU - Rebec, S. N.

AU - Jia, T.

AU - Zhang, C.

AU - Hashimoto, M.

AU - Lu, D. H.

AU - Moore, R. G.

AU - Shen, Z. X.

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AB - To elucidate the mechanisms behind the enhanced Tc 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 Tc of 63 K. From the similar Tc between this system and 1ML FeSe on STO (001), we conclude that strain and dielectric constant are likely unimportant to the enhanced Tc 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 Tc, it is only with the addition of interfacial electron-phonon coupling that Tc can be increased to the level seen in 1 ML FeSe on STO.

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Coexistence of Replica Bands and Superconductivity in FeSe Monolayer Films

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