Effect of A-site disorder on the percolative transport of Pr(0.7−y)HoySr0.3MnO3 (y=0.0, 0.04, 0.08 and 0.1)

The influence of A-site disorder on the magnetic and transport properties of Pr0.7−yHoySr0.3MnO3 (y=0, 0.04, 0.08 and 0.1) polycrystalline samples is analyzed within the context of percolative transport and the existence of Griffiths phase. It is seen that the metal-insulator transition temperature is higher than the Curie temperature and coincides with the Griffiths temperature. The percolation threshold was found to increase with the increase in the A-site disorder.