Observation of a $d$-wave gap in electron-doped Sr${}_2$IrO${}_4$

Abstract

High temperature superconductivity in cuprates emerges out of a highly enigmatic `pseudogap' metal phase. The mechanism of high temperature superconductivity is likely encrypted in the elusive relationship between the two phases, which spectroscopically is manifested as Fermi arcs---disconnected segments of zero-energy states---collapsing into $d$-wave point nodes upon entering the superconducting phase. Here, we reproduce this distinct cuprate phenomenology in the 5$d$ transition-metal oxide Sr${}_2$IrO${}_4$. Using angle-resolved photoemission, we show that clean, low-temperature phase of 6-8$\%$ electron-doped Sr${}_2$IrO${}_4$ has gapless excitations only at four isolated points in the Brillouin zone with a predominant $d$-wave symmetry of the gap. Our work thus establishes a connection between the low-temperature $d$-wave instability and the previously reported high-temperature Fermi arcs in electron-doped Sr${}_2$IrO${}_4$. Although the physical origin of the $d$-wave gap remains to be understood, Sr${}_2$IrO${}_4$ is a first non-cuprate material to spectroscopically reproduce the complete phenomenology of the cuprates, thus offering a new material platform to investigate the relationship between the pseudogap and the $d$-wave gap.

References in corpus (15)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Theory of Intertwined Orders in High Temperature Superconductors
• Magnetic order in the pseudogap phase of high-$T_C$ superconductors
• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Energy gaps in high-transition temperature cuprate superconductors
• Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet
• The Ground State of the Pseudogap in Cuprate Superconductors
• Monte Carlo study of an unconventional superconducting phase in Ir-oxide J_{eff}=1/2 Mott insulators induced by carrier doping
• Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr${}_2$IrO${}_4$
• Giant Magnon Gap in Bilayer Iridate Sr3Ir2O7: Enhanced Pseudo-dipolar Interactions Near the Mott Transition
• Odd-parity triplet superconductivity in multi-orbital materials with strong spin-orbit coupling: applications to doped Sr2IrO4
• Pseudogap, Superconducting Gap, and Fermi Arc in High-Tc Cuprates Revealed by Angle-Resolved Photoemission Spectroscopy
• Transfer of spectral weight across the gap of Sr2IrO4 induced by La doping
• Hallmarks of the Mott-Metal Crossover in the Hole Doped J=1/2 Mott insulator Sr2IrO4

Cited by in corpus (159)

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• Evidence of an odd-parity hidden order in a spin-orbit coupled correlated iridate
• Recent progress on correlated electron systems with strong spin-orbit coupling
• Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds
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• Dimensionality-driven metal-insulator-transition in spin-orbit coupled SrIrO${}_3$
• Square Lattice Iridates
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• Materials design of dynamically stable $d^9$ layered nickelates
• Persistent paramagnons deep in the metallic phase of Sr${}_{2-x}$La${}_x$IrO${}_4$
• Chiral Ordering Spin Associated Glass like State in SrRuO3SrIrO3 Superlattice
• Two-magnon Raman scattering and pseudospin-lattice interactions in Sr2IrO4 and Sr3Ir2O7
• Two-dimensional $J_{\mathrm{eff}}$ = 1/2 antiferromagnetic insulator unraveled from interlayer exchange coupling in artificial perovskite iridate superlattices
• Superconductivity in nickel based 112 systems
• Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
• Spin-orbit entangled j=1/2 moments in Ba${}_2$CeIrO${}_6$ -- a frustrated fcc quantum magnet
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• A charge density wave-like instability in a doped spin-orbit-assisted weak Mott insulator
• Multipole superconductivity in nonsymmorphic Sr${}_2$IrO${}_4$
• Quantum Multicriticality near the Dirac-Semimetal to Band-Insulator Critical Point in Two Dimensions: A Controlled Ascent from One Dimension
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• Anisotropic exchange and spin-wave damping in pure and electron-doped Sr${}_2$IrO${}_4$
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• Direct experimental observation of the molecular Jeff=3/2 ground state in the lacunar spinel GaTa4Se8
• Emergent ultrafast phenomena in correlated oxides and heterostructures
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• Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr${}_{1-x}$La${}_x$)${}_3$Ir${}_2$O${}_7$
• Jahn-Teller effect in systems with strong on-site spin-orbit coupling
• Review on quasi-2D square planar nickelates
• Novel spin-orbit coupling driven emergent states in iridate-based heterostructures
• Disorder induced power-law gaps in an insulator-metal Mott transition
• Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr${}_2$IrO${}_4$
• Anisotropic softening of magnetic excitations in lightly electron doped Sr${}_2$IrO${}_4$
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• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
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• Engineering One-Dimensional Quantum Stripes from Superlattices of Two-Dimensional Layered Materials
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• Model analysis of magnetic susceptibility of Sr${}_2$IrO${}_4$ - 2D $J_{\mathrm{eff}}$ = 1/2 Heisenberg system with competing interlayer couplings
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• La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy
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