Nonlocal electron-phonon coupling of ionic charge-fluctuation type and phonon anomalies in high-temperature superconductors

2001 ◽  
Vol 64 (5) ◽  
Author(s):  
Claus Falter ◽  
Georg A. Hoffmann
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Charge Fluctuation ◽  
Phonon Coupling ◽  
Ionic Charge ◽  
Electron Phonon Coupling ◽  
Fluctuation Type

scholarly journals Electrons and Phonons in High Temperature Superconductors

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Anu Singh ◽  
Hempal Singh ◽  
Vinod Ashokan ◽  
B. D. Indu
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Heat Transport ◽  
Function Theory ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Electronic Heat Capacity ◽  
Electron Phonon Coupling ◽  
Electronic Heat ◽  
Double Time

The defect-induced anharmonic phonon-electron problem in high-temperature superconductors has been investigated with the help of double time thermodynamic electron and phonon Green’s function theory using a comprehensive Hamiltonian which includes the contribution due to unperturbed electrons and phonons, anharmonic phonons, impurities, and interactions of electrons and phonons. This formulation enables one to resolve the problem of electronic heat transport and equilibrium phenomenon in high-temperature superconductors in an amicable way. The problem of electronic heat capacity and electron-phonon problem has been taken up with special reference to the anharmonicity, defect concentration electron-phonon coupling, and temperature dependence.

scholarly journals Manifestations of the Electron-Phonon Coupling in the Spectroscopy of High-Temperature Superconductors

2010 ◽  
Vol 2010 ◽  
pp. 1-27 ◽  
Author(s):  
A. S. Mishchenko
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Intermediate Coupling ◽  
Magnetic Subsystem ◽  
Strong Electron ◽  
Optimal Doping ◽  
Phonon Spectra ◽  
Electron Phonon Coupling ◽  
Theoretical Results

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.

scholarly journals Structure and superconductivity of hydrides at high pressures

2016 ◽  
Vol 4 (1) ◽  
pp. 121-135 ◽  
Author(s):  
Defang Duan ◽  
Yunxian Liu ◽  
Yanbin Ma ◽  
Ziji Shao ◽  
Bingbing Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Crystal Structures ◽  
Room Temperature ◽  
High Pressures ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Metallic Hydrogen ◽  
Hydrogen Atoms ◽  
Strong Electron ◽  
Electron Phonon Coupling

Abstract Hydrogen atoms can provide high phonon frequencies and strong electron–phonon coupling in hydrogen-rich materials, which are believed to be potential high-temperature superconductors at lower pressure than metallic hydrogen. Especially, recently both of theoretical and experimental reports on sulfur hydrides under pressure exhibiting superconductivity at temperatures as high as 200 K have further stimulated an intense search for room-temperature superconductors in hydrides. This review focuses on crystal structures, stabilities, pressure-induced transformations, metallization, and superconductivity of hydrogen-rich materials at high pressures.

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