Supercondutividade de alta-Tc em cerâmicas Y/Nd-123 sintetizadas pelo método do acetato

Abstract

The current study has the experimental purpose of obtaining an unprecedented series of superconducting compounds (Y1-xNdx)Ba2Cu3O7-δ such that x = 0; 0.1; 0.2; 0.5 and 1,0 via the moist acetate route. The microstructure characterizations were compared with samples obtained using the conventional solid state method. Structural characterization was obtained by X-ray diffraction, stating that all the samples present the well-formed triple perovskite orthorhombic superconducting phase. The samples were subjected to electrical resistivity measurements and by means of derivation the critical temperatures of the resistive transition were obtained. Magnetic characterizations through magnetic hysteresis were made, extracting the critical current density, energy dissipated in the loop and pinning force density. Then, magnetic measurements in a constant magnetic field allowed to identify the magnetic irreversibility temperature of each sample, carried out in the cooling without presence of magnetic field (ZFC) and cooling with constant magnetic field applied (FC). Thus, this study confirms the superconducting properties of the Y/Nd-123 cuprates synthesized by the Acetate Method.