J. Garcia-Barriocanal,1 A. M. Perez-Muñoz,1,2 Z. Sefrioui,1 D. Arias,1,3 M. Varela,1,4 C. Leon,1 S. J. Pennycook,4 and J. Santamaria1 1GFMC. Dpto. Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain 2CEI Campus Moncloa, UCM-UPM, 28040 Madrid, Spain 3Grupo de Materiales Magnéticos y Nanoestructuras, Universidad del Quindı́o, Armenia, Spain 4Materials Science & Technology D...

We have succeeded recently in synthesizing a chemically stable, inert family of materials of composition Y2Ba4CuMOy (Y-2411 where M = Nb, Ta, Mo, W, Zr, Hf) within the superconducting YBa2Cu3O7-δ• (Y-123) phase matrix that forms effective flux pinning centers of nano-scale dimensions. In this paper we report the synthesis of the Y2Ba4CuBiOy phase with nano-scale dimensions that is similarly com...

The 2-dimensional (2D) Hybrid theory obtained from the coupling of ionization energy (EI) based Fermi liquid (FL) resistivity model in c-axis and resonating-valence-bond (RVB) based effective t-J model is used to analyse the Hall resistances (R (ab) H , R (c) H ) of optimally doped as well as oxygen-deficient YBa2Cu3O7−δ single crystals. It is shown that R (ab) H ∝ 1/T and R (c) H is independen...

Intermodulation distortion (IMD) of microwave signals incident upon a superconducting YBa2Cu3O7 thin film sample on LaAlO3 substrate is shown to relax as the magnetization also relaxes, revealing signature fluxon decay in distortion. The contained microchannel columnar defects that was introduced using heavy ion beam irradiation. After exposure and then removal low strength static magnetic fiel...

Transition metal oxides (TMOs) exhibit many emergent phenomena ranging from high-temperature superconductivity and giant magnetoresistance to magnetism and ferroelectricity. In addition, when TMOs are interfaced with each other, new functionalities can arise, which are absent in individual components. Here, we report results from first-principles calculations on the magnetism at the BiFeO3/YBa2...

We present in this paper an overview of the work that has been performed on hightemperature superconductor superlattices, with a special emphasis on the superconducting properties of YBa2Cu3O7/PrBa2Cu3O7 multilayers. The critical temperature and superconductivity in ultra-thin films, the vortex dynamics, and the field-temperature vortex phase diagram in YBa2Cu3O7/PrBa2Cu3O7 multilayers are stud...

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...

We have reviewed our theoretical and experimental results of the low temperature superfluid response function ρs of high temperature superconductors (HTSC). In clean high-Tc materials the in-plane superfluid density ρ ab s varies linearly with temperature. The slope of this linear T term is found to scale approximately with 1/Tc which, according to the weak coupling BCS theory for a d-wave supe...