The fluorine-free metal organic decomposition (FF-MOD) method is considered to be the lowest cost one for mass production of REBCO thin films among various methods such as Pulsed-Laser-Deposition (PLD), Metal-Organic-Chemical-Vapor-Deposition (MOCVD), trifluoroacetate (TFA)-MOD and Reactive Co-Evaporation by Deposition & Reaction (RCE-DR). Fast crystal growth of REBCO via simple reaction, flat...
The architecture of REBa2Cu3O7+δ (REBCO, RE = rare earth) coated conductors has been essentially unchanged for more than 20 years with a REBCO film deposited on an insulating oxide buffer stack on Hastelloy C276 substrate. In this work, we explored two innovative buffer stack designs, (1) double-sided conductor to improve critical current (Ic) and (2) electrically- conductive buffer stack for...
The addition of nanosize defects to (Y,RE)Ba2Cu3O7-z (Y,RE-Ba-Cu-O or (Y,RE)BCO) superconductor thin films have been studied by many groups world-wide, to enhance flux pinning and strongly increase critical current densities (Jcs). A large variety of defect additions have been studied, including so-called 1D, 2D and 3D defects. The (M/(Y,RE)BCO)N multilayer system has been studied by many...
In a recent study in probing the effect of the pinning efficiency of BaZrO3 (BZO) nanorods in BZO-doped YBa2Cu3O7-x (BZO/YBCO) nanocomposite films, Ca diffusion from two Ca0.3Y0.7Ba2Cu3O7-x spacers that form multilayers through alternative stacking with three BZO/YBCO layers was found to significantly enhance the pinning by approximately five folds at high fields up to 9.0 T. This raises a...
Oxygen overdosing may be a way to further increase the critical current density of coated conductors. It has recently been shown that overdosing of of YBCO thin film coated with an Ag layer was achieved by processing at low temperature and 1 bar oxygen pressure, which allowed increasing the charge carrier density and achieving whatever high critical current 90 MA•cm−2 at 5 K, which corresponds...
Realizing ultra-high supercurrent density in iron-based superconductors (IBS) is a crucial step toward practical applications at high magnetic fields. However, engineering the most effective pinning structure to maximize the critical current density (Jc) remains an open challenge. In this work, Ba1-xKxFe2As2 single crystals were irradiated by low-energy Xe ions within seconds, achieving an...
Superconductivity in iron-based materials is an active area of research due to the unconventional nature of the electron-electron interactions. The simplest material in this family is the layered 11 type iron chalcogenides. Iron selenide(FeSe) when alloyed with tellurium(Te) can alter many superconducting properties. The layered nature of this material allows for unique interactions with other...
