Oxygen Deficient YBa2Cu3O7-δ: Two Superconducting Phases

Ferromagnetic/superconducting proximity effect in La0.7Ca0.3MnO3 /YBa2Cu3O7−δ superlattices

Coexistence of Superconductivity and Ferromagnetic Phases in YBa2Cu3O7−δ Nanoparticles

High-temperature superconductor YBa2Cu3O7−δ (YBCO) nanopowders were synthesized by the citrate-gel route, which is a modification of the sol-gel method. The fine powders were calcinated at 860 and 900 °C. They were of small size, in the range of 30–35 nm. X-ray diffraction (XRD) patterns verified production of the orthorhombic superconducting phase in all samples. Measuring the magnetic propert...

Insulating PrBa2Cu3O7−δ and superconducting YBa2Cu3O7−δ: charge transfer modified by disorder

The (mostly) insulating behaviour of PrBa2Cu3O7−δ is still unexplained and even more interesting since the occasional appearance of superconductivity in this material. Since YBa2Cu3O7−δ is nominally iso-structural and always superconducting, we have measured the electron momentum density in these materials. We find that they differ in a striking way whereas LDA based calculations predict simila...

Preparation of YBa2Cu3O7−δ superconducting thick film on Ni−W tapes via electrophoretic deposition

The preparation of La0.4Sr0.6TiO3 (LSTO) buffer layer and YBa2Cu3O7−δ (YBCO) superconducting thick film by a low cost technology was studied. The crystal orientation of LSTO and YBCO films was detected by X-ray diffraction, the conductivity of LSTO film and superconductivity of YBCO coating were investigated by standard four-probe method. Excellent in-plane alignment, smooth and dense LSTO buff...

Grain Boundary Induced Magneto-Far Infrared Resonances in Superconducting YBa2Cu3O7−δ Thin Films

Spectral features induced by 45 in-plane misoriented grains have been observed in the far infrared magneto-transmission of YBa2Cu3O7−δ thin films. Two strong dispersive features are found at 80 and 160 cm−1 and a weaker one at 116 cm−1. The data can be well represented by Lorentzian oscillator contributions to the conductivity. Several possible interpretations are discussed. We conclude that th...