Nanoparticles of BaSnO3 were incorporated into YBa2Cu3O7−x (YBCO) films on LaAlO3 substrates for magnetic flux pinning enhancements. More than an order of magnitude improvement in the high field magnetization Jc at 6 T at 77 K was observed as compared to regular YBCO films. The irreversibility field (Hirr) was increased to 8.5 T at 77 K and to 13.4 T at 65 K. The in-field transport current meas...

Broken time reversal symmetry (BTRS) in d wave superconductors is studied and is shown to yield current carrying surface states. The corresponding spontaneous magnetization is temperature independent near the critical temperature Tc for weak BTRS, in accord with recent data. The Hall conductance is found to vanish at zero wavevector q and finite frequency ω, however at finite q, ω it has an unu...

Significant improvement of the signal-to-noise ratio (SNR for magnetic resonance imaging (MRI) applications, in which the thermal noise of the rf receiver probe dominates the system noise can be achieved by cooling down a normal metal probe or by using superconductors. In this work, the SNR enhancement expected from using superconductors for single coil and/or phased array designs are calculate...

Spin-pumping across ferromagnet/superconductor (F/S) interfaces has attracted much attention lately. Yet the focus been mainly on s-wave superconductors-based systems whereas (high-temperature) d-wave superconductors such as YBa2Cu3O7-d (YBCO) have received scarce despite their fundamental and technological interest. Here we use wideband ferromagnetic resonance to study spin-pumping effects in ...

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...