High-Tc superconductivity up to 55 K under high pressure in the heavily electron doped Lix(NH3)yFe2Se2 single crystal

Abstract

We report a high-pressure study on the heavily electron doped Lix(NH3)yFe2Se2 single crystal by using the cubic anvil cell apparatus. The superconducting transition temperature Tc = 44 K at ambient pressure is first suppressed to below 20 K upon increasing pressure to Pc = 2 GPa, above which the pressure dependence of Tc(P) reverses and Tc increases steadily to ca. 55 K at 11 GPa. These results thus evidenced a pressure-induced second high-Tc superconducting (SC-II) phase in Lix(NH3)yFe2Se2 with the highest Tcmax = 55K among the FeSe-based bulk materials. Hall data confirm that in the emergent SC-II phase the dominant electron-type carrier density undergoes a fourfold enhancement and tracks the same trend as Tc(P). Interesting, we find a nearly parallel scaling behavior between Tc and the inverse Hall coefficient for the SC-II phases of both Lix(NH3)yFe2Se2 and (Li,Fe)OHFeSe. The present work demonstrates that high pressure offers a distinctive means to further raising the maximum Tc of heavily electron doped FeSe-based materials by increasing the effective charge carrier concentration via a plausible Fermi surface reconstruction at Pc.

arXiv comment14 pages, 4 figures

References in corpus (25)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Reemerging superconductivity at 48 K across quantum criticality in iron chalcogenides
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Two-dome structure in electron-doped iron arsenide superconductors
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals
• (Li0.84Fe0.16)OHFe0.98Se superconductor: Ion-exchange synthesis of large single crystal and highly two-dimensional electron properties
• Bipartite magnetic parent phases in the iron-oxypnictide superconductor
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Tuning phase transitions of FeSe thin flakes by field effect transistor with solid ion conductor as gate dielectric
• Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer
• Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• Effects of strain on the electronic structure, superconductivity, and nematicity in FeSe studied by angle-resolved photoemission spectroscopy
• Surface electronic structure and evidence of plain s-wave superconductivity in (Li0.8Fe0.2)OHFeSe
• How correlated is the FeSe/SrTiO${}_3$ system ?
• Superconductivity across Lifshitz transition and anomalous insulating state in surface K-dosed (Li0.8Fe0.2OH)FeSe
• Gate-tuned Superconductor-Insulator transition in (Li,Fe)OHFeSe
• Extreme anisotropy and anomalous transport properties of heavily electron doped Lix(NH3)yFe2Se2 single crystals
• New Superconductivity Dome in LaFeAsO${}_{1-x}$F${}_x$ Accompanied by Structural Transition
• Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals
• Origin of pressure induced second superconducting dome in AyFe2-xSe2 [A=K, (Tl,Rb)]

Cited by in corpus (15)

• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Pressure-induced monotonic enhancement of Tc to over 30 K in the superconducting Pr0.82Sr0.18NiO2 thin films
• Competition of superconductivity and charge density wave in selective oxidized CsV3Sb5 thin flakes
• Double-dome superconductivity under pressure in the V-based Kagome metals AV3Sb5 (A = Rb and K)
• Spectroscopic Evidence of Superconductivity Pairing at 83 K in Single-Layer FeSe/SrTiO3 Films
• Heavily Hydride-ion-doped 1111-type Iron-based Superconductors: Synthesis, Physical Properties and Electronic Structure
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Realization of continuously electron doping in bulk iron selenides and identification of a new superconducting zone
• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Stoichiometry and defect superstructures in epitaxial FeSe films on SrTiO3
• Effective minimal model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Superconductivity of 30.4 K and its Reemergence under Pressure in Fe1.11Se Synthesized via Ion-exchange and De-intercalation Reaction