High-Tc Superconducting YBa2Cu3O7-δ Films and YBa2Cu3O7-δ/PrBa2Cu3O7-δ Superlattices Deposited by Laser Ablation

Ferromagnetic/superconducting proximity effect in La0.7Ca0.3MnO3 /YBa2Cu3O7−δ superlattices

Magnetism and superconductivity in La0.7Ca0.3MnO3/YBa2Cu3O7−δ superlattices

Insulating PrBa2Cu3O7−δ and superconducting YBa2Cu3O7−δ: charge transfer modified by disorder

The (mostly) insulating behaviour of PrBa2Cu3O7−δ is still unexplained and even more interesting since the occasional appearance of superconductivity in this material. Since YBa2Cu3O7−δ is nominally iso-structural and always superconducting, we have measured the electron momentum density in these materials. We find that they differ in a striking way whereas LDA based calculations predict simila...

Dynamics of the dendritic flux instability in YBa2Cu3O7-δ films

– We have studied the dynamics of magnetic-flux avalanches in superconducting YBa2Cu3O7−δ films by means of a fast magneto-optic pump-probe technique. Two regimes of propagation are found: in regime I, directly after the nucleation of the avalanches by a femtosecond laser pulse, the velocity v of the flux dendrites depends strongly on the magnetic field, and values of v up to 180 km/s are obser...

Grain Boundary Induced Magneto-Far Infrared Resonances in Superconducting YBa2Cu3O7−δ Thin Films

Spectral features induced by 45 in-plane misoriented grains have been observed in the far infrared magneto-transmission of YBa2Cu3O7−δ thin films. Two strong dispersive features are found at 80 and 160 cm−1 and a weaker one at 116 cm−1. The data can be well represented by Lorentzian oscillator contributions to the conductivity. Several possible interpretations are discussed. We conclude that th...