Dynamical vortices in electron-phonon superconductors

Electron-Phonon Properties of Pnictide Superconductors

In this paper we discuss the normal and superconducting state properties of two pnictide superconductors, LaOFeAs and LaONiAs, using Migdal-Eliashberg theory and density functional perturbation theory. For pure LaOFeAs, the calculated electron-phonon coupling constant λ = 0.21 and logarithmic-averaged frequency ωln = 206K, give a maximum Tc of 0.8 K, using the standard Migdal-Eliashberg theory....

Vertex-corrected tunneling inversion in electron-phonon mediated superconductors: Pb

The McMillan-Rowell tunneling inversion program, which extracts the electron-phonon spectral function aF(V) and the Coulomb pseudopotential m* from experimental tunneling data, is generalized to include the lowest-order vertex correction. We neglect the momentum dependence of the electron-phonon matrix elements, which is formally equivalent to using a local approximation. The perturbation theor...

Predictions of highest Transition-temperature for electron-phonon superconductors

Using the Eliashberg strong coupling theory with vertex correction, we calculate maps of transition temperatures ( Tc ) of electron-phonon superconductors in full parameter space. The maximums of transition temperatures for superconductors are predicted based on the maps and the criterion of instability of superconductivity. The strong vertex correction and high transition temperature are tight...

Dynamical Cooper pairing in nonequilibrium electron-phonon systems

Michael Knap,1 Mehrtash Babadi,2 Gil Refael,2 Ivar Martin,3 and Eugene Demler4 1Department of Physics, Walter Schottky Institute, and Institute for Advanced Study, Technical University of Munich, 85748 Garching, Germany 2Institute for Quantum Information and Matter, Caltech, Pasadena, California 91125, USA 3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 4D...

Dynamical control of electron - phonon interactions with high - frequency light