Ambipolar suppression of superconductivity by ionic gating in optimally-doped BaFe2(As,P)2 ultrathin films

Abstract

Superconductivity (SC) in the Ba-122 family of iron-based compounds can be controlled by aliovalent or isovalent substitutions, applied external pressure, and strain, the combined effects of which are sometimes studied within the same sample. Most often, the result is limited to a shift of the SC dome to different doping values. In a few cases, the maximum SC transition at optimal doping can also be enhanced. In this work, we study the combination of charge doping together with isovalent P substitution and strain by performing ionic gating experiments on BaFe${}_2$(As${}_{0.8}$P${}_{0.2}$)${}_2$ ultrathin films. We show that the polarization of the ionic gate induces modulations to the normal-state transport properties that can be mainly ascribed to surface charge doping. We demonstrate that ionic gating can only shift the system away from the optimal conditions, as the SC transition temperature is suppressed by both electron and hole doping. We also observe a broadening of the resistive transition, which suggests that the SC order parameter is modulated nonhomogeneously across the film thickness, in contrast with earlier reports on charge-doped standard BCS superconductors and cuprates.

arXiv comment10 pages, 5 figures

References in corpus (51)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Controlling many-body states by the electric-field effect in a two-dimensional material
• Recent advances in iron-based superconductors toward applications
• Similarities between structural distortions under pressure and chemical doping in superconducting BaFe2As2
• 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
• Gate tuning of electronic phase transitions in two-dimensional NbSe${}_2$
• Ambipolar Insulator-to-Metal Transition in Black Phosphorus by Ionic-Liquid Gating
• Template engineering of Co-doped BaFe2As2 single-crystal thin films
• First-principles theory of field-effect doping in transition-metal dichalcogenides: Structural properties, electronic structure, Hall coefficient, and electrical conductivity
• A full superconducting dome of strong Ising protection in gated monolayer WS2
• Disorder engineering and conductivity dome in ReS2 with electrolyte gating
• Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
• Disorder-induced topological change of the superconducting gap structure in iron pnictides
• Tuning phase transitions of FeSe thin flakes by field effect transistor with solid ion conductor as gate dielectric
• A high-mobility electronic system at an electrolyte-gated oxide surface
• Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals
• Artificially engineered superlattices of pnictide superconductor
• Multi-Valley Superconductivity In Ion-Gated MoS2 Layers
• Large conductance modulation of gold thin films by huge charge injection via electrochemical gating
• What controls the phase diagram and superconductivity in Ru substituted BaFe${}_2$As${}_2$?
• Chemical Pressure and Physical Pressure in BaFe_2(As_{1-x}P_{x})_2
• Magnetotransport Experiments on Fully Metallic Superconducting Dayem Bridge Field-Effect Transistors
• New Phase Induced by Pressure in the Iron-Arsenide Superconductor K-Ba122
• Gate-tuned Superconductor-Insulator transition in (Li,Fe)OHFeSe
• Identical effects of indirect and direct electron doping of superconducting BaFe2As2 thin films
• A high resolution, hard X-ray photoemission investigation of BaFe${}_2$As${}_2$: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E${}_F$ electronic states
• Effect of 3d-doping on the electronic structure of BaFe2As2
• Disorder From the Bulk Ionic Liquid in Electric Double Layer Transistors
• Control of bulk superconductivity in a BCS superconductor by surface charge doping via electrochemical gating
• Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
• Ionic liquid gating of ultra-thinYBa${}_2$Cu${}_3$O${}_{7-x}$ films
• Electrical Modulation of Superconducting Critical Temperature in Liquid-Gated Thin Niobium Films
• Proximity Eliashberg theory of electrostatic field-effect-doping in superconducting films
• Weak Localization in Electric-Double-Layer Gated Few-layer Graphene
• Strong dopant dependence of electric transport in ion-gated MoS2
• Tuning electronic properties of FeSe${}_{0.5}$Te${}_{0.5}$ thin flakes by a novel field effect transistor
• Possible charge-density-wave signatures in the anomalous resistivity of Li-intercalated multilayer MoS2
• Huge field-effect surface charge injection and conductance modulation in metallic thin films by electrochemical gating
• Surface transport properties of Fe-based superconductors: The influence of degradation and inhomogeneity
• Superconducting Transition Temperature Modulation in NbN via EDL Gating
• Unusual pressure effects on the superconductivity of indirectly electron-doped (Ba1-xLax)Fe2As2 epitaxial films
• Carrier mobility and scattering lifetime in electric double-layer gated few-layer graphene
• Anomalous screening of an electrostatic field at the surface of niobium nitride
• Superconducting fluctuations in isovalently-substituted BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Possible observation of multiband effects
• Ru-doping on iron based pnictides: the "unfolded" dominant role of structural effects for superconductivity
• Electric field induced permanent superconductivity in layered metal nitride chloride MNCl(M: Hf and Zr)
• The interplay of electron doping and chemical pressure in Ba(Fe(1-y)Coy)2(As(1-x)Px)2
• Asymmetric Electron-Hole Decoherence in Ion-Gated Epitaxial Graphene

Cited by in corpus (11)

• Ionic Gate Spectroscopy of 2D Semiconductors
• Ionic gating in metallic superconductors: A brief review
• Full control of solid-state electrolytes for electrostatic gating
• Orientation-dependent electric transport and band filling in hole co-doped epitaxial diamond films
• Two-dimensional hole transport in ion-gated diamond surfaces: A brief review
• Theoretical explanation of electric field-induced superconductive critical temperature shifts in Indium thin films
• Strong band-filling-dependence of the scattering lifetime in gated MoS2 nanolayers induced by the opening of intervalley scattering channels
• Anomalous metallic phase in molybdenum disulphide induced via gate-driven organic ion intercalation
• Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond
• Status of Iron Based Superconductors: characteristics and relevant properties for applications
• Reversible Tuning of Superconductivity in Ion-Gated NbN Ultrathin Films by Self-Encapsulation with a High-$\kappa$ Dielectric Layer