A systematic set of measurements of the microwave ~10 GHz! surface impedance (Zs5Rs1iXs) of twinned YBa2Cu3O6.95 single crystals ~called YBCO/BZO! grown in BaZrO3 crucibles reveal properties that are not directly seen in similar measurements on other YBCO samples. The complex conductivity s5s12is2 obtained as a function of temperature (T) from the surface impedance data shows two key features :...

Epitaxial cerium oxide (CeO2) buffer layer has been grown on lanthanum aluminate (LAO) single crystal substrates for fabrication of c-axis oriented YBa2Cu3O72x (YBCO). Precursor solution of cerium acetylacetonates with viscosity of 0.6 centipoises was spin coated on the 1 × 1 cm area LAO substrates. The calcination was carried out by very slow ramp (18C per minute) until the final temperature o...

YBa2Cu3O7 d (YBCO or Y123) films on rolling-assisted biaxially textured substrates (RABiTS) were prepared via a fluorinefree metallorganic deposition (MOD) through spin coating, burnout, and high temperature anneal. The effects of substrate texture and surface energy of the CeO2 cap layer were investigated. Except for the commonly accepted key factors, such as the textures of substrate and buff...

The Meissner effect in a thin-film superconductor can be used to create a sharp boundary between regions of different magnetic field and hence can be used as a component of neutron spin manipulation devices. We have developed two cryogenic neutron spin manipulation devices using single-crystal, high-Tc, YBCO films, which can be cooled without using liquid cryogens and eliminate small angle scat...

The application of high temperature superconductors in long term tokamak fusion reactors is analyzed in this paper. Properties of high temperature superconductors have been well documented that make them ideal for this application. Short-sample BSSCO wires and YBCO tapes approach their single-crystal performance limits. This provides a useful reference frame as well as a starting point of what ...

Abstract The presence of a metallic layer can influence the properties high-temperature superconductors underneath. We investigate structures deposited in form nanoparticles or continuous layers by electron beam evaporation ion sputtering on Y1Ba2Cu3O7-x (YBCO) thin films. To generally avoid diffusion metal atoms an additional barrier is introduced. Detailed measurements magnetic moment superco...

Abstract Two different types of monoclinic HfO 2 nanocrystals were employed in this work to study the effect nanocrystal shape and crystallinity on structural defects YBa2Cu3O7−δ (YBCO) matrix as it leads an enhancement pinning performances solution-derived YBCO nanocomposite films. In nanorod-like obtained from surfactant-controlled synthesis led short intergrowths surrounding particles, while...

In addition to the well investigated YBa2Cu3O7 d (Y-123, YBCO) compound, many other rare earth-123 compounds are candidate materials for the production of coated conductors. Sm-123 seems to be an excellent alternative because of its higher transition temperature (Tc) and higher critical current densities (Jc) in external magnetic fields. Because of the fast decrease of Jc in YBCO at elevated te...

One of the worst types of fault that a power system should be designed to withstand is a short circuit. Within the various types of fault current limiters, the superconducting fault current limiter (SFCL) has an extremely fast current limitation. The rapid switching action and the self-sensing nature of the superconductor make SFCLs particularly attractive in fault protection. This very fast ti...

Dependence of the phase and magnitude of the response of MgO substrate YBa2Cu3O7 d (YBCO) transition edge bolometers to the near infrared radiation on the superconducting transition width is presented in this work. The bolometers were made of YBCO thin films of 200 nm thickness that were grown on single crystal MgO (100) substrates by DC inverted cylindrical magnetron sputtering. We have measur...