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We report the effect of Ga substitution on magnetization, magnetoresistance,and magnetostriction in polycrystalline Pr0.6Sr0.4Co1-yGayO3 (y=0.0-0.3)samples. Upon substitution of the non-magnetic Ga3+ cation for magnetic Co3+,the low-temperature ground state transforms from ferromagnetic metallic for y =0 to cluster glass semiconductor for y = 0.2. Magnetoresistance at 7T isnegative and its magnitude increases from 2 percentage for y = 0 to 30percentage for y = 0.3 at 10 K. On the other hand, magnetostriction at 10 K ispositive and its value decreases with increasing y. Interestingly, thefield-dependent magnetization, magnetoresistance, and magnetostriction for ygreater than or equal to 0.2 and at T less than or equal to 3 K show reversibleabrupt steps for both positive and negative magnetic field whereas all thesequantities vary smoothly with the magnetic field above 4 K. Such steps in allthree distinct physical quantities were never reported earlier in perovskitecobaltites and they differ from observations made in manganites andintermetallic alloys. It is suggested that field-induced avalanche flipping offerromagnetic clusters could be the origin of observed steps in all these threequantities.

Sharp steps in magnetization, magnetoresistance and magnetostriction in Pr0.6Sr0.4Co1-yGayO3