Observation of double superconducting transition in Y0.55Pr0.45Ba2Cu3O7-d polycrystalline sample by Hall effect measurement

TL;DR

This study observes a double superconducting transition in a polycrystalline Y-Pr-Ba-Cu-O sample through Hall effect measurements, revealing complex superconducting behavior and weak coupling effects.

Contribution

It reports the first observation of a double superconducting transition correlated with Hall resistance in this material, highlighting weak coupling between clusters.

Findings

Detection of nonzero transverse voltage below superconducting transition

Correlation between Hall resistance and double resistive transition

Weak coupling dominates dissipation in the superconducting state

Abstract

This work reports longitudinal (RXX) and transverse (RXY) resistance as a function of the temperature measured at low magnetic fields for a Y0.55Pr0.45Ba2Cu3O7-d polycrystalline sample. It is observed nonzero transverse voltage at zero external magnetic below superconducting transition and above no such voltage was detected. Comparing RXX (T) and RXY (T) curves it was possible to observe a correlation between Hall resistance and double resistive superconducting transition. Magneto-resistance RXX(H) measurements showed that the dissipation is dominated by weak coupling between superconducting clusters. I-V and R(T) curves of both components suggest that the positive Hall voltage at superconducting state must be related to quasiparticle currents.