Disappearance of Nodal Gap across the Insulator-Superconductor Transition in a Copper-Oxide Superconductor

Abstract

The parent compound of the copper-oxide high temperature superconductors is a Mott insulator. Superconductivity is realized by doping an appropriate amount of charge carriers. How a Mott insulator transforms into a superconductor is crucial in understanding the unusual physical properties of high temperature superconductors and the superconductivity mechanism. Here we report high resolution angle-resolved photoemission measurement on heavily underdoped Bi2Sr2-xLaxCuO6+d system. The electronic structure of the lightly-doped samples exhibit a number of characteristics: existence of an energy gap along the nodal direction, d-wave-like anisotropic energy gap along the underlying Fermi surface, and coexistence of a coherence peak and a broad hump in the photoemission spectra. Our results reveal a clear insulator-superconductor transition at a critical doping level of ~0.10 where the nodal energy gap approaches zero, the three-dimensional antiferromagnetic order disappears, and superconductivity starts to emerge. These observations clearly signal a close connection between the nodal gap, antiferromagnetism and superconductivity.

22 pages, 5 figures

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Cited by in corpus (52)

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• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
• Coexistence of charge-density-wave and pair-density-wave orders in underdoped cuprates
• Visualizing the evolution from the Mott insulator to a charge ordered insulator in lightly doped cuprates
• Point nodes persisting far beyond Tc in Bi2212
• Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films
• Relationship between the parent charge transfer gap and maximum transition temperature in cuprates
• High Resolution Angle Resolved Photoemission with Tabletop 11eV Laser
• Direct observation of charge order in underdoped and optimally doped Bi${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$ by resonant inelastic x-ray scattering
• Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb)${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$ cuprate superconductor family
• Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
• Magic angles and correlations in twisted nodal superconductors
• The special role of the first Matsubara frequency for superconductivity near a quantum-critical point -- the non-linear gap equation below $T_c$ and spectral properties in real frequencies
• Hidden Fermi-liquid charge transport in the antiferromagnetic phase of the electron-doped cuprates
• Can deeply underdoped superconducting cuprates be topological superconductors?
• The interplay between superconductivity and non-Fermi liquid at a quantum-critical point in a metal
• The emergence of global phase coherence from local pairing in underdoped cuprates
• Charge Berezinskii-Kosterlitz-Thouless transition in superconducting NbTiN films
• Momentum-Resolved Visualization of Electronic Evolution in Doping a Mott Insulator
• Spin-charge interplay in antiferromagnetic La${}_{2-x}$Sr${}_x$CuO${}_4$ studied by the muons, neutrons, and ARPES techniques
• Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed
• Evolution of Charge and Pair Density Modulations in Overdoped Bi2Sr2CuO6+delta
• Two types of superconducting domes in unconventional superconductors
• Superconductivity above a quantum critical point in a metal -- gap closing vs gap filling, Fermi arcs, and pseudogap behavior
• Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator Sr${}_{2-x}$La${}_x$IrO${}_4$
• Superconducting phase diagram of itinerant antiferromagnets
• Real-space pairing through a confined local nematic state in cuprate superconductors
• Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca${}_2$CuO${}_2$Cl${}_2$
• Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate
• Electronic Evolution from the Parent Mott Insulator to a Superconductor in Lightly Hole-Doped Bi2Sr2CaCu2O8+delta
• Nanoscale phase separation in deep underdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ and Ca${}_2$CuO${}_2$Cl${}_2$
• Three interaction energy scales in single-layer high-T${}_C$ cuprate HgBa${}_2$CuO${}_{4+\delta }$
• Insulating Parent Phase and Distinct Doping Evolution to Superconductivity in Single-Layer FeSe/SrTiO3 Films
• Prediction of $f$-wave pairing symmetry in YBa${}_2$Cu${}_3$O${}_{6+x}$ cuprates
• Doping asymmetry of superconductivity coexisting with antiferromagnetism in spin fluctuation theory
• The High Temperature Superconductivity in Cuprates: Physics of the Pseudogap Region
• Topological phases due to the coexistence of superconductivity and spin-density wave: Application to high Tc superconductors in the underdoped regime
• Superconductivity, pair density wave, and Neel order in cuprates
• Ferroelectricity in underdoped La-based cuprates
• Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$
• Opening a nodal gap by fluctuating spin-density-wave in lightly doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Topological phase in a $d_{x^2-y^2}+(p+ip)$ superconductor in presence of spin-density-wave
• Influence of oxygen-coordination number on the electronic structure of single-layer La-based cuprates
• Nodeless superconducting gap induced by odd parity pair density wave in underdoped cuprates
• Variable range hopping theory for the nodal gap in strongly underdoped cuprate Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$
• Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator
• Persistent Fermi Pockets and Robust Electron Pairing in Lightly Doped CuO${}_2$ Planes of Cuprate Superconductors
• Electronic Structure and Superconducting Gap of HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$