Pseudogap formation above the superconducting dome in iron-pnictides

Abstract

The nature of the pseudogap in high transition temperature (high-Tc) superconducting cuprates has been a major issue in condensed matter physics. It is still unclear whether the high-Tc superconductivity can be universally associated with the pseudogap formation. Here we provide direct evidence of the existence of the pseudogap phase via angle-resolved photoemission spectroscopy in another family of high-Tc superconductor, iron-pnictides. Our results reveal a composition dependent pseudogap formation in the multi-band electronic structure of BaFe2(As1-xPx)2. The pseudogap develops well above the magnetostructural transition for low x, persists above the nonmagnetic superconducting dome for optimal x and is destroyed for x ~ 0.6, thus showing a notable similarity with cuprates. In addition, the pseudogap formation is accompanied by inequivalent energy shifts in xz/yz orbitals of iron atoms, indicative of a peculiar iron orbital ordering which breaks the four-fold rotational symmetry.

14 pages, 10 figures

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• Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors
• Unconventional superconductivity in the BiS${}_2$-based layered superconductor NdO${}_{0.71}$F${}_{0.29}$BiS${}_2$
• High-Tc Superconductivity near the Anion Height Instability in Fe-based Superconductors: Analysis of LaFeAsO${}_{1-x}$H${}_x$
• The phase diagrams of iron-based superconductors: theory and experiments
• Orbital-selective metal-insulator transition and gap formation above Tc in superconducting Rb1-xFe2-ySe2
• Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Nonlocal correlations induced by Hund's coupling: a cluster DMFT study
• The form and the origin of the orbital ordering in the electronic nematic phase of the Iron-based superconductors
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Coexistence of orbital degeneracy lifting and superconductivity in iron-based superconductors
• Imaging anomalous nematic order and strain in optimally doped BaFe${}_2$(As,P)${}_2$
• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Collapse of critical nematic fluctuations in FeSe under pressure
• Anomalous electron transport in epitaxial NdNiO${}_3$ films
• Pseudogap behavior in charge density wave kagome material ScV${}_6$Sn${}_6$ revealed by magnetotransport measurements
• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
• Two types of superconducting domes in unconventional superconductors
• Imaging Nematic Transitions in Iron-Pnictide Superconductors with a Quantum Gas
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Hidden antiferro-nematic order in Fe-based superconductor BaFe${}_2$As${}_2$ and NaFeAs above $T_S$
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
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• Field-induced nematic-like magnetic transition in an iron pnictide superconductor, Ca${}_{10}$(Pt${}_3$As${}_8$)((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• Phonon Anomalies, Orbital-Ordering and Electronic Raman Scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: Temperature-dependent Raman Study
• Anisotropy of electronic correlations: On the applicability of local theories to layered materials
• Diverging Nematic Susceptibility, Physical Meaning of T* scale, and Pseudogap in the Spin Fermion Model for Pnictides
• In-plane anisotropy of transport coefficients in the electronic nematic states: Universal origin of the nematicity in Fe-based superconductors
• Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Hubbard Model
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• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Quasiparticle scattering interference in iron pnictides: A probe of the origin of nematicity
• Superconducting Order Parameters in overdoped BaFe${}_{1.86}$Ni${}_{0.14}$As${}_2$ Revealed by Multiple Andreev Reflection Spectroscopy of Planar Break-Junctions
• Drude weight anisotropy in the doped iron pnictides: the primary role of orbital weight redistribution along the reconstructed Fermi surfaces
• Defect-induced electronic smectic state at the surface of nematic materials
• Superconducting gap in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ from temperature dependent transient optical reflectivity
• Doping dependence of the critical fluctuation regime in the Fe-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Probing a Bose Metal via Electrons: Inescapable non-Fermi liquid scattering and pseudogap physics
• Possible signature of broken symmetry state near the quantum critical point in P doped BaFe${}_2$As${}_2$: A Raman spectroscopy study
• From Cooper-pair glass to unconventional superconductivity: a unified approach to cuprates and pnictides
• Orbital-selective electronic excitations in iron arsenides revealed by simulated nonresonant inelastic x-ray scattering
• Unconventional superconductivity after the BCS paradigm and empirical rules for the exploration of high temperature superconductors
• Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
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• Orbital-lattice coupling and orbital ordering instability in iron pnictides
• Non-relativistic fermionic energy gap in the non-abelian gauge systems
• Proximity-induced hidden order transition in a correlated heterostructure Sr${}_2$VO${}_3$FeAs