Search

The recovery of superconductivity in water degraded YBa 2 Cu 3 O 7− δ samples has been studied by subjecting them to heat treatments. The possible recovery of superconductivity has been estimated through structural, electrical, magnetic and morphological investigations. The results reveal the transformation of secondary phases formed during degradation into YBCO phase. The presence of some additional phases of YBCO, possibly arising from deficiency of the constituent elements resulting from degradation/lack of proper reaction between the secondary phases, is also observed. The heat treatment carried out on a sample after pulverising it led to full recovery of superconductivity in it. A possible mechanism for the observed recovery of superconductivity has been suggested.