The electronic relaxation times are determined via pump-probe optical spectroscopy using sub-15 fs pulses over a wide range of probe energies for two different cuprate superconductors. Based on the exact analytic solution for the electron relaxation, we extract values for the second moments of the Eliashberg functions. These values suggest a fundamental importance of the electron-phonon interaction and in particular polaronic effects in the superconducting pairing mechanism in the cuprates.
COBISS.SI-ID: 24255783
The electronic relaxation times are determined via pump-probe optical spectroscopy using sub-50 fs pulses for two different pnictide superconductors. Based on the exact analytic solution for the electron relaxation, we extract values for the second moments of the Eliashberg functions. These results suggest that electron phonon coupling constant is not large lambda~0.2.
COBISS.SI-ID: 23811367
We consider flux penetration to a superconducting cylinder. We show that in the low field limit the kinetics is deterministic. In the strong field limit the dynamics becomes stochastic. Surprisingly the inhomogeneity in the cylinder lead to the predominance of Kelvin-Helmholtz vortices.
COBISS.SI-ID: 24014631
It is shown that the Cooper pairing in the states with small angular momenta is strongly suppressed with the realistic Coulomb repulsion between fermions at relevant temperatures in any dimension.
COBISS.SI-ID: 24587303
Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN.
COBISS.SI-ID: 25208615