Discrete superconducting phases in FeSe-derived superconductors

Abstract

A general feature of unconventional superconductors is the existence of a superconducting dome in the phase diagram as a function of carrier concentration. For the simplest iron-based superconductor FeSe (with transition temperature Tc ~ 8 K), its Tc can be greatly enhanced by doping electrons via many routes, even up to 65 K in monolayer FeSe/SiTiO3. However, a clear phase diagram with carrier concentration for FeSe-derived superconductors is still lacking. Here, we report the observation of a series of discrete superconducting phases in FeSe thin flakes by continuously tuning carrier concentration through the intercalation of Li and Na ions with a solid ionic gating technique. Such discrete superconducting phases are robust against the substitution of Se by 20% S, but are vulnerable to the substitution of Fe by 2% Cu, highlighting the importance of the iron site being intact. A complete superconducting phase diagram for FeSe-derivatives is given, which is distinct from other unconventional superconductors.

arXiv comment24 pages, 5 figures

References in corpus (33)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity in Iron Compounds
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• 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
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• The Challenge of Unconventional Superconductivity
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Observation of superconductivity at 30 K~46 K in AxFe2Se2 (A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
• Metallic ground state in an ion-gated two-dimensional superconductor
• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Electric-field-induced superconductivity in electrochemically-etched ultrathin FeSe films on SrTiO3 and MgO
• Iron based high transition temperature superconductors
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy
• Superconducting Phases in Potassium-Intercalated Iron Selenides
• Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
• Surface electronic structure and isotropic superconducting gap in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
• Tuning phase transitions of FeSe thin flakes by field effect transistor with solid ion conductor as gate dielectric
• Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz
• Metal - Insulator transition in Fe1.01-xCuxSe
• Orbital selectivity and emergent superconducting state from quasi-degenerate $s-$ and $d-$wave pairing channels in iron-based superconductors
• Orbital selective pairing and superconductivity in iron selenides
• Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe
• Anisotropic Hc2 of K0.8Fe1.76Se2 determined up to 60 T
• Extreme anisotropy and anomalous transport properties of heavily electron doped Lix(NH3)yFe2Se2 single crystals

Cited by in corpus (22)

• Van der Waals thin films of WTe2 for natural hyperbolic plasmonic surfaces
• High-entropy van der Waals materials formed from mixed metal dichalcogenides, halides and phosphorus trisulfides
• Exploring Topological Superconductivity in Topological Materials
• Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
• Electrically tunable magnetism and unique intralayer charge transfer in Janus monolayer MnSSe for spintronics applications
• Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe${}_2$ superconductor
• Incommensurate smectic phase in close proximity to the high-Tc superconductor FeSe/SrTiO3
• Superconductivity in Li-intercalated 1T-SnSe2 driven by electric-field gating
• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Gate-Tunable Critical Current of the Three-Dimensional Niobium Nano-Bridge Josephson Junction
• Structural and electronic phase transitions driven by electric field in metastable MoS${}_2$ thin flake
• Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates
• Ionic liquid gating induced two superconductor-insulator phase transitions in spinel oxide Li${}_{1\pm x}$Ti${}_2$O${}_{4-\delta }$
• Anomalous metallic phase in molybdenum disulphide induced via gate-driven organic ion intercalation
• High-throughput investigation of tunable superconductivity in FeSe films
• Ferromagnetic inter-layer coupling in FeSe${}_{1-x}$S${}_x$ superconductors revealed by inelastic neutron scattering
• Electric-field controlled superconductor-ferromagnetic insulator transition
• What controls the superconducting dome of electron-doped FeSe?
• Fragile pressure-induced magnetism in FeSe superconductors with a thickness reduction
• Enhancement of Superconductivity Linked with Linear-in-Temperature/Field Resistivity in Ion-Gated FeSe Films
• Superconducting weak links at substrate steps in bilayer nickelate films