Superconductivity in single-layer films of FeSe with a transition temperature above 100 K

Abstract

Recently, interface has been employed to enhance superconductivity in the single-layer FeSe films grown on SrTiO3(001)(STO) with a possible Tc of ~ 80 K, which is nearly ten times of the Tc of bulk FeSe and is above the Tc record of 56 K for the bulk Fe-based superconductors. This work together with those on superconducting oxides interfaces revives the long-standing idea that electron pairing at a two-dimensional (2D) interface between two different materials is a potential path to high transition temperature (Tc) superconductivity. Subsequent angle-resolved photoemission spectroscopy (ARPES) measurements revealed different electronic structure from those of bulk FeSe with a superconducting-like energy gap closing at around 65K. However, previous ex situ electrical transport measurements could only detect the zero-resistance below ~30 K. Here we report the observation of high Tc superconductivity in the FeSe/STO system. By in situ 4-point probe (4PP) electrical transport measurement that can be conducted at an arbitrary position of the FeSe film on STO, we detected superconductivity above 100 K. Our finding makes FeSe/STO the exciting and ideal research platform for higher Tc superconductivity.

arXiv comment10 pages, 3 figures, 7 pages supplementary materials

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• Visualizing quantum phenomena at complex oxide interfaces: an atomic view from scanning transmission electron microscopy
• Strong enhancement of magnetic order from bulk to stretched monolayer FeSe as Hund's metals
• Nematicity, magnetic fluctuation and ferro-spin-orbital ordering in BaFe${}_2$As${}_2$ family
• Strong Landau-quantization effects in high-magnetic-field superconductivity of a two-dimensional multiple-band metal near the Lifshitz transition
• Anisotropy of upper critical fields and interface superconductivity in FeSe/SrTiO3 grown by PLD
• Charge carrier dynamics of FeSe thin film investigated by terahertz magneto-optical spectroscopy
• Structure, superconductivity, and magnetism in Rb1-xFe1.6Se2-zSz
• Isotropic Cooper Pairs with Emergent Sign Changes in Single-Layer Iron Superconductor
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Molecular Beam Epitaxy Growth of Tetragonal FeS Film on SrTiO3(001) Substrate
• Optimal Boson energy for superconductivity in the Holstein model
• Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state
• Orbital selectivity versus Pomeranchuk instability in the iron-chalcogenide superconductors: A two-loop renormalization group study
• Non-charge-transfer origin of Tc Enhancement in a Surface Superconductor Si(111)-(root7xroot3)-In with Adsorbed Organic Molecules
• High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow
• Superconductivity of highly spin-polarized electrons in FeSe probed by ${}^{77}$Se NMR
• Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO${}_3$
• The electronic structure and magnetic phase transition of hexagonal FeSe thin films studied by photoemission spectroscopy
• Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing
• Direct Evidence of Two Superconducting Gaps in FeSe${}_{0.5}$Te${}_{0.5}$: SnS-Andreev Spectroscopy and Lower Critical Field
• Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring
• Quasiparticle interference in multiband superconductors with strong coupling
• Imaging Se diffusion across the FeSe/SrTiO${}_3$ interface
• Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation
• Phase transitions in a frustrated biquadratic Heisenberg model with coupled orbital degree of freedom for iron-based superconductors
• Observation of the signatures of sub-resolution defects in two-dimensional superconductors with scanning SQUID
• Superconducting proximity effect in a Rashba-type surface state of Pb/Ge(111)
• In-plane p-wave coherence length in iron-based superconductors
• Stronger quantum fluctuation with larger spins: Emergent magnetism in the pressurized high-temperature superconductor FeSe
• Tunable Kondo resonance at a pristine two-dimensional Dirac semimetal on a Kondo insulator
• Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides
• Self-consistent Bogoliubov de Gennes theory of the vortex lattice state in a two-dimensional strong type-II superconductor at high magnetic fields
• Resonance states near a quantum magnetic impurity in single-layer FeSe superconductors with $d$-wave symmetry
• Phase-separation control of K${}_x$Fe${}_{2-y}$Se${}_2$ superconductor through rapid-quenching process
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Magnetic behaviour of dirty multiband superconductors near the upper critical field
• Controllable magnetic anisotropy and ferroelasticity in superconducting FeSe monolayer with surface fluorine adsorption
• Observation of two distinct superconducting domes under pressure in tetragonal FeS
• Experimentally constrained multidimensional simulation of laser-generated plasmas and its application to UV nanosecond ablation of Se and Te
• Fermi- to non-Fermi-liquid crossover and Kondo transition in two-dimensional Cu${}_{2/3}$V${}_{1/3}$V${}_2$S${}_4$
• Ultra high temperature superfluidity in ultracold atomic Fermi gases with mixed dimensionality
• Effect of the additional Se layer on the electronic structure of iron-based superconductor FeSe/SrTiO${}_3$
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• Detecting Thermodynamic Phase Transition via Explainable Machine Learning of Photoemission Spectroscopy
• Core Electron Spectroscopic Studies for 11-Fe-based Superconductors
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Capping layer influence and isotropic in-plane upper critical field of the superconductivity at the FeSe/SrTiO3 interface
• Ferromagnetic inter-layer coupling in FeSe${}_{1-x}$S${}_x$ superconductors revealed by inelastic neutron scattering
• Two new parent compounds for FeSe-based superconducting phases
• High-resolution ARPES endstation for in-situ electronic structure investigations at SSRF
• Phonon Spectra in the Parent Superconducting Iron-tuned Telluride Fe${}_{1+x}$Te from Inelastic Neutron Scattering and Ab Initio Calculations
• Enhancing the hybridization of plasmons in graphene with 2D superconductor collective modes
• Self-consistent and Maxwell approximations to describe the excess conductivity anisotropy in FeSe above superconducting transition temperature
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Observation of metallic electronic structure in a single-atomic-layer oxide
• Enhanced superconductivity in PbTe-In hybrids
• Brillouin zone folding method for quasiperiodic superconductivity in multilayer systems: application to electronic structure and optical responses
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals
• Particle-Hole Transformation in Strongly-Doped Iron-Based Superconductors
• Quantum Well Electronic States in Spatially Decoupled 2D Pb Nanoislands on Nb-doped SrTiO3(001)
• Effects of Chemical Pressure on Superconductivity in Electrochemically Intercalated (TMA)yFe2(Se1-xSx)2 (TMA = Tetramethylammonium)
• Kondo-like behavior in a mixed valent oxypnictide $\mathrm{L}{\mathrm{a}}_3\mathrm{C}{\mathrm{u}}_4{\mathrm{P}}_4{\mathrm{O}}_2$
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Study on fluctuations of interface-enhanced superconductivity in ultrathin FeSe/SrTiO3 by the Nernst effect
• Understanding and enhancing superconductivity in FeSe/STO by quantum size effects
• Anisotropy of the transport properties of NdFeAs(O,F) thin films grown on vicinal substrates
• Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe
• Origin of the Electronic Structure in Single-Layer FeSe/SrTiO3 Films
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Analyzing scanning tunneling spectroscopy for Fe-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and extracting $s$-wave density of states
• Artificially Engineered Nanostrain in Iron Chalcogenide Superconductor Thin Film for Enhancing Supercurrent
• Superconductivity of 30.4 K and its Reemergence under Pressure in Fe1.11Se Synthesized via Ion-exchange and De-intercalation Reaction
• Ubiquity of rotational symmetry breaking in superconducting films, from Fe(Te,Se)/Bi${}_2$Te${}_3$ to Nb, and the effect of measurement geometry
• Controlling Orbital Ordering of Intergrowth Structures with Flat [Ag(II)F2] Layers to Mimic Oxocuprates(II)
• 2D Weyl Fermi gas model of Superconductivity in the Surface state of a Topological Insulator at High Magnetic fields
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
• Anisotropic Thermal Transport in Superconductors with Coexisting Spin Density Waves
• Formation of single-phase disordered CsxFe2-ySe2 at high pressure
• KOMPASS: the new cold neutron triple-axis-spectrometer specialized for polarization analysis
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$
• Stripe Antiferromagnetic Ground-State Configuration of FeSe Revealed by Density Functional Theory
• Depairing critical current density and the vortex-free state in FeSe nanobridges
• Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1-xVxSe
• Anisotropic transport of Josephson vortices in atomic-layer superconductors on vicinal surfaces
• Fragile pressure-induced magnetism in FeSe superconductors with a thickness reduction
• Linear Foundation Model for Quantum Embedding: Data-Driven Compression of the Ghost Gutzwiller Variational Space
• Unconventional incommensurate epitaxy of superconducting FeSe films on SrTiO${}_3$
• Hidden Ladder in SrMoO${}_3$/SrTiO${}_3$ Superlattices: Experiments and Theoretical Calculations
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds
• Band structure of organic-ion-intercalated (EMIM)${}_x$FeSe superconductor
• Synthesis and characterizations of arsenic doped FeSe bulks
• Imaging GHz surface acoustic wave modes in electrostricted LaAlO${}_3$/SrTiO${}_3$ heterostructures