High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001)

Abstract

We report on the observation of high-temperature ($T_{\text{c}}$) superconductivity and magnetic vortices in single-unit-cell FeSe films on anatase TiO${}_2$(001) substrate by using scanning tunneling microscopy. A systematic study and engineering of interfacial properties has clarified the essential roles of substrate in realizing the high-$T_{\text{c}}$ superconductivity, probably via interface-induced electron-phonon coupling enhancement and charge transfer. By visualizing and tuning the oxygen vacancies at the interface, we find their very limited effect on the superconductivity, which excludes interfacial oxygen vacancies as the primary source for charge transfer between the substrate and FeSe films. Our findings have placed severe constraints on any microscopic model for the high-$T_{\text{c}}$ superconductivity in FeSe-related heterostructures.

arXiv comment5 Pages, 3 figures

References in corpus (21)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Tunable polaronic conduction in anatase TiO2
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Critical role of substrate in the high temperature superconductivity of single layer FeSe on Nb:BaTiO${}_3$
• Visualizing Nodal Heavy Fermion Superconductivity in CeCoIn5
• Low-lying Quasiparticle Excitations around a Vortex Core in Quantum Limit
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Direct evidence for an intrinsic square vortex lattice in the overdoped high-Tc superconductor La1.83Sr0.17CuO4+d
• What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study
• Observation of a Triangular to Square Flux Lattice Phase Transition in YBCO
• Reentrant vortex lattice transformation in four-fold symmetric superconductors

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• Electronic structure of FeSe monolayer superconductors: shallow bands and correlations
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• Stoichiometry and defect superstructures in epitaxial FeSe films on SrTiO3
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• The phonon mechanism explanation of the superconductivity dichotomy between FeSe and FeS monolayers on STO and other substrates
• Inferior interfacial superconductivity in 1 UC FeSe/SrVO${}_3$/SrTiO${}_3$ with screened interfacial electron-phonon coupling
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Quantum Well Electronic States in Spatially Decoupled 2D Pb Nanoislands on Nb-doped SrTiO3(001)
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Superconductivity in the bilayer Hubbard model: Are two Fermi surfaces better than one?
• Fabrication of oxide/FeSe multilayer films using the PLD technique
• Interfacial Polarons Driven by Charge Transfer In WSe2/Cuprate Superconductor Systems