Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors

Abstract

Previous experimental results have shown important differences between iron selenide and arsenide superconductors, which seem to suggest that the high temperature superconductivity in these two subgroups of iron-based family may arise from different electronic ground states. Here, we report the complete phase diagram of a newly synthesized superconducting (SC) system (Li1-xFex)OHFeSe with a similar structure to FeAs-based superconductors. In the non-SC samples, an antiferromagnetic (AFM) spin-density-wave (SDW) transition occurs at ~127 K. This is the first example to demonstrate such an SDW phase in FeSe-based superconductor system. Transmission electron microscopy (TEM) shows that a well-known sqrr(5) x sqrr(5) iron vacancy ordered state, resulting in an AFM order at ~ 500K in AyFe2-xSe2 (A = metal ions) superconductor system, is absent in both non-SC and SC samples, but a unique superstructure with a modulation wave vector q=1/2(1, 1, 0), identical to that seen in SC phase of KyFe2-xSe2, is dominant in the optimal SC sample (with an SC transition temperature Tc = 40 K). Hence, we conclude that the high-Tc superconductivity in (Li1-xFex)OHFeSe stems from the similarly weak AFM fluctuations as FeAs-based superconductors, suggesting a universal physical picture for both iron selenide and arsenide superconductors.

4 pages, 3 tables, 3 figures, accepted for publication in JACS

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Cited by in corpus (21)

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• Superconducting (Li, Fe)OHFeSe film of high quality and high critical parameters
• Effects of magnetic dopants in (Li${}_{0.8}$M${}_{0.2}$OH)FeSe (M = Fe, Mn, Co): a density-functional theory study using band unfolding technique
• Ionic-liquid-gating induced protonation and superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2, and Bi2Se3
• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• Low-energy spin excitations in Li(0.8)Fe(0.2)ODFeSe superconductor studied with inelastic neutron scattering
• New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors $A_x$(C${}_8$H${}_{11}$N)${}_y$Fe${}_{1-z}$Se ($A$ = Li, Na) with the Largest Interlayer Spacings and $T_{\mathrm{c}}$ $\sim$ 40 K
• Canted Antiferromagnetism in the Quasi-1D Iron Chalcogenide BaFe${}_2$Se${}_4$
• Basic electronic properties of iron selenide under variation of structural parameters
• Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors
• Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li${}_x$(C${}_6$H${}_{16}$N${}_2$)${}_y$Fe${}_{2-z}$Se${}_2$: Dependence on the Intercalation Temperature and Lithium Content
• Electronic structure and nematic phase transition in superconducting multi-layer FeSe films grown by pulsed laser deposition method
• Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe
• Possible pairing symmetry in the FeSe-based superconductors determined by quasiparticle interference
• In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands
• Evolution of orbital excitations from insulating to superconducting MgTi${}_2$O${}_4$ films
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• 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