Abstract
A review of experimental and theoretical results on the spectroscopy of high-temperature superconductors is presented. The models where hole doped into antiferromagnet interacts both with magnetic subsystem and with phonons are considered. Theoretical results of these models for phonon spectra, angle resolved photoemission spectra, and optical conductivity are presented. Comparison with experimental data gives evidence for the strong electron-phonon coupling in the undoped and weakly doped high-temperature superconductors. The strength of electron-phonon coupling decreases with doping though at the optimal doping the compounds are still in the intermediate coupling regime.
Highlights
The role of the electron-phonon interaction (EPI) in the high-temperature superconductors is debated for many years
T-J model predicted a peak in the Optical Conductivity (OC) [9,10,11,12,13,14,15,16,17,18,19,20,21,22], situated roughly at the same energy as the Mid Infrared (MIR) band observed in experiments [23,24,25,26,27,28]
Large EPI in cuprates arises due to strong electronic correlations [61, 89] because calculations by Local Density Approximation (LDA) method give the coupling constants which are smaller by an order of magnitude [99]
Summary
The role of the electron-phonon interaction (EPI) in the high-temperature superconductors is debated for many years. In such case the chemical potential must be pinned not to the observed broad shake-off peak but to the real invisible quasiparticle. One of the evidences is the two-peak structure of the MIR part of OC in the underdoped compounds which is reproduced by taking the EPI into account [51] Another confirmation is the anomalous temperature dependence of the width of the ARPES peak which can be explained only by the interplay of magnetic and lattice system [50, 60].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
