Observation of anomalous reentrant superconductivity in Sr1-xKxBiO3 - art.no. 064502

We report the observation of a reentrant superconducting-normal resistive t ransition in Sr1-xKxBiO3 superconductors. In contrast to previously reporte d reentrant resistive transition behaviors, the reentrant resistivity appea ring at zero magnetic field is suppressed to zero by applying an external m agnetic field (H) or increasing the, electrical transport current (I): an o bservation of the recovery of a zero resistive superconducting state induce d by H or I. An analysis of the normal-state resistivity data indicates the important role that disordered junction barriers between superconducting g rains might play on the observed reentrant resistivity behavior. Possible p hysical origins of this anomalous phenomenon are discussed.