Strain dependent spin-blockade effect realization in the charge-disproportionated SrCoO2.5 thin films

The spin-blockade phenomena occur in the charge-ordered systems because of the non-conservation of the spin-states of the charges across the charge hopping process. Here, we have investigated the validation of the spin-blockade phenomena in a different kind of charge-ordered system, viz. charge-disproportionated SrCoO2.5 thin film, where O-2p hole is the key parameter for such charge-ordering. It is observed with the help of the polarization-dependent O K-edge x-ray absorption spectroscopy that the spin-blockade increases with the decrease in charge-disproportionation vis-à-vis O-2p hole density in the SrCoO2.5 films. The spin-blockade has been realized in terms of the lowest energy charge fluctuation energetics in the SrCoO2.5 films. Our results provide a fundamental understanding of the spin-blockade phenomena in both the usual charge-ordered and unusual charge-disproportionated systems, which would lead to a path forward toward novel material designing.