Two Gaps Make a High Temperature Superconductor?

Abstract

One of the keys to the high-temperature superconductivity puzzle is the identification of the energy scales associated with the emergence of a coherent condensate of superconducting electron pairs. These might provide a measure of the pairing strength and of the coherence of the superfluid, and ultimately reveal the nature of the elusive pairing mechanism in the superconducting cuprates. To this end, a great deal of effort has been devoted to investigating the connection between the superconducting transition temperature Tc and the normal-state pseudogap crossover temperature T*. Here we present a review of a large body of experimental data that suggests a coexisting two-gap scenario, i.e. superconducting gap and pseudogap, over the whole superconducting dome.

Related material can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/articles.html

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• Magnetic Resonant excitations in High-{${\mathrm{T}}_{\mathrm{c}}$} superconductors
• Extracting the electron--boson spectral function ${\alpha }^2$F($\omega$) from infrared and photoemission data using inverse theory
• Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
• Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6
• Phenomenological description of the two energy scales in underdoped superconducting cuprates
• Hole photoproduction in insulating copper oxide
• Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport
• Doping dependence of the electronic Raman spectra in cuprates
• ARPES on HTSC: simplicity vs. complexity
• Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped superconductor La${}_{1.895}$Sr${}_{0.105}$CuO${}_4$
• Twin spin/charge roton mode and superfluid density: primary determining factors of $T_c$ in high-$T_c$ superconductors observed by neutron, ARPES, and $\mu$SR
• Universality of the Electronic Structure from a Half Filled CuO_2 Plane
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• Charge order driven by Fermi-arc instability in Bi2201
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• Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
• The Hubbard model: A computational perspective
• How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+d
• The remarkable underlying ground states of cuprate superconductors
• Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
• Superconductivity and the Pseudogap in the two-dimensional Hubbard model
• Magnetism in Fe-based superconductors
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• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Direct measurement of the upper critical field in a cuprate superconductor
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor
• Josephson effect in fermionic superfluids across the BEC-BCS crossover
• Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective
• A Phenomenological Theory of the Anomalous Pseudogap Phase in Underdoped Cuprates
• Machine Learning of Explicit Order Parameters: From the Ising Model to SU(2) Lattice Gauge Theory
• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Evidence of precursor superconductivity as high as 180 K from infrared spectroscopy
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• Loss of nodal quasiparticle integrity in underdoped YBa2Cu3O6+x
• Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
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• Coexistence of competing orders with two energy gaps in real and momentum space in high-Tc superconductor Bi2Sr2-xLaxCuO6+delta
• High Field Studies of Superconducting Fluctuations in High-T_c Cuprates: Evidence for a Small Gap distinct from the Large Pseudogap
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• Interface high-temperature superconductivity
• Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
• Physics of the Pseudogap in 8-site Cluster Dynamical Mean Field Theory: photoemission, Raman scattering, in-plane and c-axis conductivity
• Anomalies in the pseudogap phase of the cuprates: Competing ground states and the role of umklapp scattering
• Electron scattering, charge order, and pseudogap physics in La${}_{1.6-x}$Nd${}_{0.4}$Sr${}_x$CuO${}_4$: An angle resolved photoemission spectroscopy study
• Intermediate Coupling Model of the Cuprates
• When Superconductivity Crosses Over: From BCS to BEC
• A Tale of Two Metals: contrasting criticalities in the pnictides and hole-doped cuprates
• Universal properties of high temperature superconductors from real space pairing: t-J-U model and its quantitative comparison with experiment
• Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
• The doping-driven evolution of the superconducting state of a doped Mott insulator: a key for the high temperature superconductivity
• Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy
• Theoretical study of insulating mechanism in multi-orbital Hubbard models with a large spin-orbit coupling: Slater versus Mott scenario in Sr${}_2$IrO${}_4$
• Quasiparticles in the Pseudogap Phase of Underdoped Cuprate
• Comparative Study of BCS-BEC Crossover Theories above $T_c$: the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
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• Kinetic-energy driven superconductivity in cuprate superconductors
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• ARPES experiment in fermiology of quasi-2D metals (Review Article)
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• Evidence of a photoinduced non-thermal superconducting-to-normal-state phase transition in overdoped Bi${}_2$Sr${}_2$Ca${}_{0.92}$Y${}_{0.08}$Cu${}_2$O${}_{8+\delta }$
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• The nodal gap component as a good candidate for the superconducting order parameter in cuprates
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• Bogoliubov's Vision: Quasiaverages and Broken Symmetry to Quantum Protectorate and Emergence
• Friedel Oscillations as a Probe of Fermionic Quasiparticles
• Metal-insulator transition and superconductivity induced by Rh doping in binary Ru Pnictides RuPn (Pn = P, As and Sb)
• Two gaps with one energy scale in cuprate superconductors
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• A Two Energy Gap Preformed-Pair Scenario For the Cuprates: Implications for Angle-Resolved Photoemission Spectroscopy
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• New insights into the phase diagram of the copper oxide superconductors from electronic Raman scattering
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