Bipartite magnetic parent phases in the iron-oxypnictide superconductor

Abstract

High-temperature (high-$T_{\mathrm{c}}$) superconductivity appears as a consequence of the carrier-doping of an undoped parent compound exhibiting antiferromagnetic order; thereby, ground-state properties of the parent compound are closely relevant to the superconducting state. On the basis of the concept, a spin-fluctuation has been addressed as an origin of pairing of the superconducting electrons in cuprates. Whereas, there is growing interest in the pairing mechanism such as an unconventional spin-fluctuation or an advanced orbital-fluctuation due to the characteristic multi-orbital system in iron-pnictides. Here, we report the discovery of an antiferromagnetic order as well as a unique structural transition in electron-overdoped LaFeAsO${}_{1-x}$H${}_x$ ($x$ ~ 0.5), whereby another parent phase was uncovered, albeit heavily doped. The unprecedented two-dome superconducting phases observed in this material can be interpreted as a consequence of the carrier-doping starting from the original at $x\sim 0$ and advanced at $x\sim 0.5$ parent phases toward the intermediate region. The bipartite parent phases with distinct physical properties in the second magnetic phase provide us with an interesting example to illustrate the intimate interplay among the magnetic interaction, structural change and orbital degree of freedom in iron-pnictides.

12pages, 4 figures

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• Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO
• High-Tc superconductivity up to 55 K under high pressure in the heavily electron doped Lix(NH3)yFe2Se2 single crystal
• Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure
• Emergence of Novel Antiferromagnetic Order Intervening between Two Superconducting Phases in LaFe(As_1-x_P_x_)O: 31P-NMR Studies
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• High pressure growth and electron transport properties of superconducting SmFeAsO1-xHx single crystals
• Three superconducting phases with different categories of pairing in hole- and electron-doped LaFeAs${}_{1-x}$P${}_x$O
• Quantum Phase transition under pressure in a heavily hydrogen-doped iron-based superconductor LaFeAsO
• Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi${}_2$Se${}_{2-x}$S${}_x$
• Effective interaction for vanadium oxyhydrides Sr${}_{n+1}$V${}_n$O${}_{2n+1}$H${}_n$ ($n=1$ and $n\to \infty$): A constrained-RPA study
• Crossover between magnetism and superconductivity in low H-doped LaFeAsO
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
• Suppression of superconductivity and structural phase transition against pressure in Ca${}_{10}$(Ir${}_4$As${}_8$)(Fe${}_{2-x}$Ir${}_x$As${}_2$)${}_5$
• Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca${}_{1-x}$La${}_x$FeAs${}_2$