Loi d'échelle dans YBa2Cu3O7-x céramique

بررسی خواص مغناطیسی ابررسانای سرامیکی Yba2Cu3O7-x/Ag

EFFECTS OF EPITAXIAL STRAIN ON THE GROWTH MECHANISM OF YBa2Cu3O7−x THIN FILMS IN [YBa2Cu3O7−x/PrBa2Cu3O7−x] SUPERLATTICES

We report on the growth mechanism of YBa2Cu3O7−x. Our study is based on the analysis of ultrathin, YBa2Cu3O7−x layers in c-axis oriented YBa2Cu3O7−x / PrBa2Cu3O7 superlattices. We have found that the release of epitaxial strain in very thin YBCO layers triggers a change in the dimensionality of the growth mode. Ultrathin, epitaxially strained, YBCO layers with thickness below 3 unit cells grow ...

Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires

High-resolution focused ion beam lithography has been used to fabricate YBa₂Cu₃O7-x (YBCO) wires with nanometric lateral dimensions. In the present work, we investigate Flux-flow instabilities in nanowires of different widths, showing sudden voltage switching jumps from the superconducting to the normal state. We present an extensive study on the temperature and field dependence of the switchin...

An All Sol-Gel Process for the Heteroepitaxial Growth of YBa2Cu3O7-x/LaNiO3/YBa2Cu3O7-x Tri-layer

The preparation of a YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x sandwich structured film on a LaAlO3 (100) substrate by a sol-gel method was investigated. YBa2Cu3O7−x/LaNiO3/YBa2Cu3O7−x tri-layer heterostructures with different epitaxial characteristics can be deposited by controlling the heat treatment temperature. X-ray diffraction and transmission electron microscopy results show that the bottom YBCO fi...

Five Minute LOI Test

Loss-on-ignition (LOI) is an important thermo-chemical property test for many foundry materials. Applications include new sands, green sand systems, chemically bonded cores and molds, sand additives, and reclaimed sands. LOI has been an important quality control measure carried out off-line. The AFS-defined LOI test uses a muffle furnace that is time consuming, often requiring three hours; a mo...