Bosons in high temperature superconductors: an experimental survey

Abstract

We review a number of experimental techniques that are beginning to reveal fine details of the bosonic spectrum α^2F(Ω) that dominates the interaction between the quasiparticles in high temperature superconductors. Angle-resolved photo emission (ARPES) shows kinks in electronic dispersion curves at characteristic energies that agree with similar structures in the optical conductivity and tunnelling spectra. Each technique has its advantages. ARPES is momentum resolved and offers independent measurements of the real and imaginary part of the contribution of the bosons to the self energy of the quasiparticles. The optical conductivity can be used on a larger variety of materials and with the use of maximum entropy techniques reveals rich details of the spectra including their evolution with temperature and doping. Scanning tunnelling spectroscopy offers spacial resolution on the unit cell level. We find that together the various spectroscopies, including recent Raman results, are pointing to a unified picture of a broad spectrum of bosonic excitations at high temperature which evolves, as the temperature is lowered into a peak in the 30 to 60 meV region and a featureless high frequency background in most of the materials studied. This behaviour is consistent with the spectrum of spin fluctuations as measured by magnetic neutron scattering. However, there is evidence for a phonon contribution to the bosonic spectrum as well.

71 pages, 52 figures

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• A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates
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• Direct extraction of the Eliashberg function for electron-phonon coupling: A case study of Be(1010)
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• Photoemission kinks and phonons in cuprates
• High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission
• Momentum dependence of the electron-phonon coupling and self-energy effects in YBa_2Cu_3O_7 within the local density approximation
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• Preeminent role of the Van Hove singularity in the strong-coupling analysis of scanning tunneling spectroscopy for two-dimensional cuprates
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• Low-energy (< 10 meV) feature in the nodal electron self-energy and strong temperature dependence of the Fermi velocity in Bi(2)Sr(2)CaCu(2)O(8+delta)
• Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime in superconducting cuprates
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• Imaging the essential role of spin-fluctuations in high-Tc superconductivity
• Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4
• Bosonic spectral density of epitaxial thin-film La1.83Sr0.17CuO4 superconductors from infrared conductivity measurements
• An ARPES view on the high-Tc problem: phonons vs spin-fluctuations
• Finite band inversion of ARPES in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ in comparison with optics
• Superconductivity-Induced Self-Energy Evolution of the Nodal Electron of Optimally-Doped Bi2212
• Role of Inelastic Tunneling through the Barrier in Scanning Tunneling Microscope Experiments on Cuprates
• Coupling of Low Energy Electrons in Optimally Doped Bi2212 to an Optical Phonon Mode
• Magnetic collective mode in underdoped cuprates: a phenomenological analysis
• Properties of the phonon-induced pairing interaction in YBa${}_2$Cu${}_3$O${}_7$ within the local density approximation
• Through a Lattice Darkly -- Shedding Light on Electron-Phonon Coupling in the High T${}_c$ Cuprates
• Characteristics of oxygen isotope substitutions in the quasiparticle spectrum of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Electron-boson glue function derived from electronic Raman scattering
• Impurity effects on optical response in a finite band electronic system coupled to phonons
• Excitation of a bosonic mode by electron tunneling into a cuprate superconductor
• Spectral signatures of critical charge and spin fluctuations in cuprates

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• Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
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• Evidence of a spin resonance mode in the iron-based superconductor Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ from scanning tunneling spectroscopy
• Transport and optics at the node in a nodal loop semimetal
• Optical spectroscopy shows that the normal state of URu${}_2$Si${}_2$ is an anomalous Fermi liquid
• Quasiparticle Interference and Strong Electron-Mode Coupling in the Quasi-One-Dimensional Bands of Sr${}_2$RuO${}_4$
• Quasiparticle Properties of the Superconducting State of the Two Dimensional Hubbard Model
• Aspects of electron-phonon interactions with strong forward scattering in FeSe Thin Films on SrTiO${}_3$ substrates
• Effective SU(2) theory for the pseudogap state
• Strong-Coupling Superconductivity in NaFe${}_{1-x}$Co${}_x$As: the Eliashberg Theory and Beyond
• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Optical conductivity of semi-Dirac and pseudospin-1 models: Zitterbewegung approach
• Quantifying many-body effects by high-resolution Fourier transform scanning tunneling spectroscopy
• Disappearance of Superconductivity Due to Vanishing Coupling in the Overdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Effect of electron-phonon coupling on energy and density of states renormalizations of dynamically screened graphene
• Signatures of merging Dirac points in optics and transport
• Evolution of spectral and transport quantities with doping in the SU(2) theory of cuprates
• Higgs Oscillations in time-resolved Optical Conductivity
• Pseudogap-induced coexistence of Fermi arcs and Fermi pockets in cuprate superconductors
• Charge density waves as the origin of dip-hump structures in differential tunneling conductance of cuprates: the case of $d$-wave superconductivity
• Electron-boson spectral density function of correlated multiband systems obtained from optical data: Ba0.6K0.4Fe2As2 and LiFeAs
• Superconducting coherence lengths of hole-doped cuprates obtained from electron-boson spectral density functions
• Self-energy effects in electronic Raman spectra of doped cuprates due to magnetic fluctuations
• Peak-structure in self-energy of cuprate superconductors
• Interplay between charge order and superconductivity in cuprate superconductors
• Anomalous electron spectrum and its relation to peak structure of electron scattering rate in cuprate superconductors
• Determination of boson spectrum from optical data in pseudogap phase of underdoped cuprates
• Optical Self Energy in Graphene due to Correlations
• Electron self-energy from quantum charge fluctuations in the layered t-J model with long-range Coulomb interaction
• Unified intermediate coupling description of the pseudogap and the strange metal phases of cuprates
• In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy
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• Anisotropic dressing of electrons in electron-doped cuprate superconductors
• Temperature and field dependence of the intrinsic tunnelling structure in overdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Intrinsic temperature-dependent evolutions in the electron-boson spectral density obtained from optical data
• Spectroscopic signatures of phonons in high pressure superconducting hydrides
• Evolution of electron-boson spectral density in the underdoped region of Bi_2Sr_{2-x}La_xCuO_6
• Reverse process of usual optical analysis of boson-exchange superconductors: impurity effects on $s$- and $d$-wave superconductors
• High energy fluctuation spectra in cuprates from infrared optical spectroscopy
• Infrared properties of cuprates in the pseudogap state: A study of Mitrovic-Fiorucci and Sharapov-Carbotte scattering rates
• Rebuttal to "Comment by V.M. Krasnov on 'Counterintuitive consequence of heating in strongly-driven intrinsic junctions of Bi2Sr2CaCu2O8+d Mesas' "
• Optical study of hybridization and hidden order in URu${}_2$Si${}_2$
• Analysis of optical data using extended Drude model and generalized Allen's formulas
• Plasmarons in high-temperature cuprate superconductors
• Optical response in Weyl semimetal in model with gapped Dirac phase
• Doping and momentum dependence of coupling strength in cuprate superconductors
• Distinguishing Coulomb and electron-phonon interactions for massless Dirac fermions
• A comparative study of finite frequency scattering rate from Allen, Mitrović-Fiorucci, Shulga-Dolgov-Maksimov, Sharapov-Carbotte and Götze-Wölfle Memory Function formalisms
• Quasiparticle scattering interference in cuprate superconductors
• Electron-boson spectral density of LiFeAs obtained from optical data
• Renormalization of electrons in bilayer cuprate superconductors
• Theory of dual fermion superconductivity in hole-doped cuprates
• Electron-boson spectral density functions of cuprates obtained from optical spectra via machine learning
• Retaining Landau quasiparticles in the presence of realistic charge fluctuations in cuprates
• Identifying a forward scattering superconductor through pump-probe spectroscopy
• Optical Properties of Bogoliubov Quasiparticles
• Anomalous isotope effect in BCS superconductors with two boson modes
• Extended Drude model analysis of superconducting optical spectra of correlated electron systems
• Bosonic excitation spectra of superconducting $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ and $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$ extracted from scanning tunneling spectra
• Unusual electronic structure in underdoped cuprate superconductors
• Comments on the d-wave pairing mechanism for cuprate high $T_c$ superconductors: Higher is different?
• Critical spin fluctuations across the superconducting dome in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Isotope Effect of Underdoped Cuprates in the Yang-Rice-Zhang Model
• Simulation of a hump structure in the optical scattering rate within a generalized Allen formalism and its application to copper oxide systems
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• Dynamics of superconducting pairs in the two-dimensional Hubbard model
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• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors
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