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We present detailed magnetization and magneto-transport studies on the titlecompound SmCoAsO. In a recent paper we reported [1] the complex magnetism ofthis compound. SmCoAsO undergoes successive paramagnetic (PM) - ferro-magnetic(FM) - anti-ferro-magnetic (AFM) transitions with decrease in temperature. Thisis mainly driven via the c-direction interaction of Sm4f (SmO layer) spins withadjacent (CoAs layer) ordered Co3d spins. In this article we present anevidence of kinetic arrest for FM-AFM transition. The isothermal magnetization(MH) loops for SmCoAsO exhibited the meta-magnetic transitions at 6, 8 and 10Kat around 80, 60 and 50kOe fields respectively with characteristic hysteresisshoulders along with the non-zero moment at origin, thus suggesting thepossibility of kinetic arrest. Suggested kinetic arrest is further evident inzero field-cooled (ZFC) and field-cooled (FC) hysteresis under high fields ofup to 140kOe magnetization (MT) and the magneto-transport measurements R(T)Hduring FM-AFM transition. The time dependent moment experiments exhibited verysmall (~2-3%) increase of the same below 20kO and decrease for 30kOe at 15K.

Interplay of Sm4f and Co3d spins in SmCoAsO