Abstract
We report the grain size effect of hole-doped cobaltite,La0.88Sr0.12CoO3, where average sizesare varied from ∼ 35 to ∼ 240 nm. The bulk compound is a cluster-glass (CG) compound composed of short rangeferromagnetic (FM) clusters embedded in the spin-glass (SG) matrix at low temperature. Theshort range FM clusters are still retained in the nanocrystalline compound with average size ∼ 35 nm which are associated with the SG component, displaying CG-like spin dynamics atlow temperature. The exchange bias (EB) effect manifested by the shifts in thehysteresis loop is observed due to the field cooling where EB effect is weakenedsystematically with decreasing grain size. The decrease in the fraction of the FMcomponent is found to be correlated with the weakening of the EB effect withdecreasing grain size. Interestingly, the signature of the EB phenomenon due tothe field-cooled effect is also evidenced in the temperature as well as the timedependence of resistivity. The grain interior phase separation scenario around theFM/SG interface region has been proposed to interpret the experimental results.
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