The Influence of Gadolinium Content in GdBCO Industrial 2G HTS Wires on the Superconducting Properties in Magnetic Field

The study of the 12 mm wide 2G HTS wires with gadolinium excess is presented. The GdBCO layer was grown by pulsed laser deposition (PLD) using commercial production equipment and contained different concentration of Gd: pristine sample, +15%, +30% and +45% of Gd content. The samples were characterized by transport measurements over wide temperature (T) and magnetic field (B) ranges. The microstructure investigations were carried out by scanning transmission electron microscopy. The resistivity curves of the samples were measured in the field up to 9 T. We determined that the irreversibility temperature (Tirr) derived from these curves has a maximum in case of B‖ab. Irreversibility temperature has been decreased with increasing of applied magnetic field from 0 то 3 Т and that confirmed by measurements of the resistivity transition as imaginary part of magnetic susceptibility (χ”). The maximum of Tirr obtained in the experiments indicate a different pinning structure mechanism in the studied samples.