Showing papers by "COMPAS published in 1997"
TL;DR: In this article, the formation of growth spirals on YBa 2 Cu 3 O 7-δ thin films was found to be induced by putting the substrate well into the laser plume, and the growth mode transition was attributed to a change in surface diffusivity.
Abstract: Using Pulsed Laser Deposition, we find that a high background pressure favours the formation of growth spirals on YBa 2 Cu 3 O 7-δ thin films. At these elevated pressures 2D-nucleation and growth can be induced by putting the substrate well into the laser plume. We attribute this growth mode transition to a change in surface diffusivity. This confirms the close relationship between plume dynamics and surface kinetics in PLD.
5 citations
TL;DR: In this article, high quality twin-free c-axis oriented YBa2Cu3O7 films were grown by pulsed laser deposition on NdGaO3 and they found resistive anisotropies between 1 < a/b < 1.6.
Abstract: High quality twin-free c-axis oriented YBa2Cu3O7 films were grown by pulsed laser deposition on NdGaO3. We find resistive anisotropies between 1 < a/b < 1.6. The resistive anisotropy above Tc appears to be correlated to the anisotropy in the critical current below Tc. The normal state properties of the chains along b seem to have a significant influence on the superconducting properties of YBa2Cu3O7.
4 citations