Abstract
Resistances of grain junctions of bulk polycrystalline YBa2Cu3O7−δ (YBCO) and DyBa2Cu3O7−δ (DyBCO) superconductors have been extracted following (i) Ambegaokar- Baratoff (AB) and (ii) de Gennes (dG) equations. Current–voltage (IV) below the critical temperature (Tc) has been used to extract transport critical current density (Jc). The variations of the junction resistances, (RN) with temperature (T) exhibit that below a critical value of the normalised superfluid density (NSD), junctions become very low resistive and exhibit metallicity. Dependence of this feature of RN on the energy gaps has also been explored. Weak scattering limit is found to be compatible with the maximum of RN (T) as is observed from the corresponding NSD.
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