scholarly journals Interplay of electron-phonon interaction and electron correlation in high-temperature superconductivity

2004 ◽  
Vol 69 (14) ◽  
Author(s):  
Sumio Ishihara ◽  
Naoto Nagaosa
Keyword(s):  
High Temperature ◽  
Electron Correlation ◽  
High Temperature Superconductivity ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

ELECTRON-PHONON INTERACTION WITHIN THE FRAMEWORK OF THE FLUCTUATING VALENCE OF COPPER ATOMS — A THEORETICAL MODEL FOR HIGH TEMPERATURE SUPERCONDUCTIVITY

1990 ◽  
Vol 04 (05) ◽  
pp. 325-331
Author(s):  
SURESH V. VETTOOR ◽  
V. M. NANDAKUMARAN
Keyword(s):  
High Temperature ◽  
Theoretical Model ◽  
Green's Function ◽  
High Temperature Superconductivity ◽  
Experimental Results ◽  
Function Technique ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Good Agreement ◽  
Quasiparticle Excitations

Electron-phonon interaction is considered within the framework of the fluctuating valence of Cu atoms. Anderson's lattice Hamiltonian is suitably modified to take this into account. Using Green's function technique the possible quasiparticle excitations are determined. The quantity 2∆k(0)/k B T c is calculated for T c = 40 K . The calculated values are in good agreement with the experimental results.

scholarly journals The Gap and the Upper Critical FieldHc2as Function of Doping for High-TcCuprates

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Orozco ◽  
R. M. Méndez-Moreno ◽  
M. A. Ortiz
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
Energy Gap ◽  
High Temperature Superconductors ◽  
Upper Critical Field ◽  
Superconducting Gap ◽  
Phonon Interaction ◽  
As Doping ◽  
Electron Phonon Interaction ◽  
Wave Symmetry

The relation between thed-wave superconducting gapΔ0and the specific heat obtained with the Volovik effect is used to determine the upper critical fieldHc2as doping function, for high-temperature superconductors. A two-components model withd-wave symmetry, within the BCS framework, is introduced to describe the superconducting state. Generalized Fermi surface topologies are used in order to increase the density of states at the Fermi level, allowing the high-Tcvalues observed. The electron-phonon interaction is considered the most relevant mechanism for the high-Tccuprates, where the available phonon energy is provided by the half-breathing modes. The energy gap valuesΔ0calculated with this model are introduced to describe the variation of the upper critical fieldHc2as function of doping, forLa2-xSrxCuO4.

SUPERCONDUCTIVITY WITH SOFT LATTICE MODES IN LaBaCuO and YBaCuO

2001 ◽  
Vol 15 (32) ◽  
pp. 4145-4160 ◽  
Author(s):  
STEPHEN NETTEL
Keyword(s):  
Electron Correlation ◽  
Pair Correlation ◽  
Negative Energy ◽  
Variational Calculation ◽  
Phonon Interaction ◽  
Phonon Softening ◽  
Intermediate Coupling ◽  
Normal Coordinates ◽  
Electron Phonon Interaction ◽  
Lattice Modes

The canonical transformation employed in polaron theory at intermediate coupling is generalized to the electron phonon interaction of an entire band of electrons. Interelectron interactions result. The overall lattice-electron correlation is obtained with a variational calculation, balancing the extra elastic energy stored in the lattice against the negative energy arising from BCS pair correlation. The requisite phonon softening to attain any given value of Tc in metallic LaBaCuO and YBaCuO are estimated. The implicit fluctuations in the lattice normal coordinates are compared with results yielded by the EXAFS measurements of Oyanagi et al.

scholarly journals Adiabatic Electron-Phonon Interaction and High-Temperature Thermodynamics ofA15Compounds

2008 ◽  
Vol 101 (10) ◽  
Author(s):  
O. Delaire ◽  
M. S. Lucas ◽  
J. A. Muñoz ◽  
M. Kresch ◽  
B. Fultz
Keyword(s):  
High Temperature ◽  
Phonon Interaction ◽  
Electron Phonon Interaction
Sign in / Sign up

Export Citation Format

Share Document