Bosonic spectral density of epitaxial thin-film La1.83Sr0.17CuO4 superconductors from infrared conductivity measurements

Abstract

We use optical spectroscopy to investigate the excitations responsible for the structure in the optical self-energy of thin epitaxial films of La1.83Sr0.17CuO4. Using Eliashberg formalism to invert the optical spectra we extract the electron-boson spectral function and find that at low temperature it has a two component structure closely matching the spin excitation spectrum recently measured by magnetic neutron scattering. We contrast the temperature evolution of the spectral density and the two-peak behavior in La2-xSrxCuO4 with another high temperature superconductor Bi2Sr2CaCu2O8+d. The bosonic spectral functions of the two materials account for the low Tc of LSCO as compared to Bi-2212.

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• Optical spectroscopy of superconducting Ba{0.55}K{0.45}Fe2As2: evidence for strong coupling to low energy bosons
• Pairing dynamics in strongly correlated superconductivity
• Intermediate Coupling Model of the Cuprates
• Bosonic Spectral Function and The Electron-Phonon Interaction in HTSC Cuprates
• Determination of the optical properties of La{2-x}Ba{x}CuO{4} for several dopings, including the anomalous x=1/8 phase
• Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4
• Doping dependent optical properties of Bi2201
• Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides
• Optical study of superconducting Pr${}_2$CuO${}_x$ with $x\simeq 4$
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• The electron-boson spectral density function of underdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and YBa${}_2$Cu${}_3$O
• Analysis of Laser ARPES from Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ in superconductive state: angle resolved self-energy and fluctuation spectrum
• Superconducting coherence lengths of hole-doped cuprates obtained from electron-boson spectral density functions
• Determination of boson spectrum from optical data in pseudogap phase of underdoped cuprates
• Crossover from inelastic magnetic scattering of Cooper pairs to spin-wave dispersion produces low-energy kink in cuprates
• 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
• Electron-boson spectral density of LiFeAs obtained from optical data
• Electron-boson spectral density functions of cuprates obtained from optical spectra via machine learning
• Eliashberg analysis of the optical conductivity in superconducting Pr${}_2$CuO${}_x$ ($x\simeq 4$)
• Simulation of a hump structure in the optical scattering rate within a generalized Allen formalism and its application to copper oxide systems