Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

Tao Jia; Zhuoyu Chen; Slavko N. Rebec; Makoto Hashimoto; Donghui Lu; Thomas P. Devereaux; Dung Hai Lee; Robert G. Moore; Zhi Xun Shen

doi:10.1002/advs.202003454

Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

Tao Jia, Zhuoyu Chen, Slavko N. Rebec, Makoto Hashimoto, Donghui Lu, Thomas P. Devereaux, Dung Hai Lee, Robert G. Moore, Zhi Xun Shen

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The enhanced superconductivity in monolayer FeSe on titanates opens a fascinating pathway toward the rational design of high-temperature superconductors. Utilizing the state-of-the-art oxide plus chalcogenide molecular beam epitaxy systems in situ connected to a synchrotron angle-resolved photoemission spectroscope, epitaxial LaTiO₃ layers with varied atomic thicknesses are inserted between monolayer FeSe and SrTiO₃, for systematic modulation of interfacial chemical potential. With the dramatic increase of electron accumulation at the LaTiO₃/SrTiO₃ surface, providing a substantial surge of work function mismatch across the FeSe/oxide interface, the charge transfer and the superconducting gap in the monolayer FeSe are found to remain markedly robust. This unexpected finding indicate the existence of an intrinsically anchored “magic” doping within the monolayer FeSe systems.

Original language	English
Article number	2003454
Journal	Advanced Science
Volume	8
Issue number	9
DOIs	https://doi.org/10.1002/advs.202003454
State	Published - May 5 2021

Funding

T.J. and Z.C. contributed equally to this work. The authors thank B. Moritz and C. D. Pemmaraju for helpful discussions. This work is supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division, under Contract DE- AC02-76SF00515. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, also under Contract No. DE-AC02-76SF00515. D.H.L. was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences, and Engineering Division under Contract No. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202). R.G.M. is supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences	DE-AC02-76SF00515
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering	DE-AC02-05-CH11231, KC2202, DE- AC02-76SF00515

Keywords

FeSe
heterostructures
interfacial charge transfer
magic doping
superconductors

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10.1002/advs.202003454

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abstract = "The enhanced superconductivity in monolayer FeSe on titanates opens a fascinating pathway toward the rational design of high-temperature superconductors. Utilizing the state-of-the-art oxide plus chalcogenide molecular beam epitaxy systems in situ connected to a synchrotron angle-resolved photoemission spectroscope, epitaxial LaTiO3 layers with varied atomic thicknesses are inserted between monolayer FeSe and SrTiO3, for systematic modulation of interfacial chemical potential. With the dramatic increase of electron accumulation at the LaTiO3/SrTiO3 surface, providing a substantial surge of work function mismatch across the FeSe/oxide interface, the charge transfer and the superconducting gap in the monolayer FeSe are found to remain markedly robust. This unexpected finding indicate the existence of an intrinsically anchored “magic” doping within the monolayer FeSe systems.",

keywords = "FeSe, heterostructures, interfacial charge transfer, magic doping, superconductors",

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AU - Lu, Donghui

AU - Devereaux, Thomas P.

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AU - Moore, Robert G.

AU - Shen, Zhi Xun

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Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

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