1.

Electron-phonon coupling constant in pnictide superconductors is determined from electron relaxation rates

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

2.

We have demonstrated how Kelvin-Helmholtz vortices are created in inhomogeneous superconductors.

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