Magnetoresistivity, fluctuation conductivity and magnetic irreversibility in the Y0.95Pr0.05Ba2Cu3O7−δ compound: a case of split pairing transition

We work out a detailed magnetoresistance, superconducting fluctuation and magnetic irreversibility study of an Y0.95Pr0.05Ba2Cu3O7-delta single crystal and polycrystalline samples. Our data reveal, besides the usual magnetic irreversibility regimes related to the intergrain and intragrain flux dynamics, a whole set of fluctuation regimes and two close genuine superconducting transitions. We suggest that this split superconducting transition is an intrinsic effect related to the condensation of two independent superconducting fluids, presumably having different orbital symmetries. Author