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We report the synthesis of fine particles of a well-known geometricallyfrustrated spin-chain compound Ca3Co2O6 through a new route, namely, apyrophoric method employing triathanolamine (TEA) and studied the magneticbehavior of such specimens. We find that this synthesis yields particles madeup of rods whose diameter appears to be controllable by the fraction of TEAduring synthesis. It is seen that the two well-known magnetic transitions (near24 and 8 K) remain unaffected for all TEA concentrations used. The most notablefinding is that the multi-step feature in the M versus magnetic-field isothermreported for single crystalline form tends to smoothen out gradually withdecreasing rod thickness (from about 1 micron to about a few hundred nm).Further, unlike for the single crystalline form known in the literature, thereis no tendency for the relaxation time (tau) to remain constant at lowtemperatures (<10 K) and tau remains temperature dependent up to the lowesttemperature measured (1.8K) in all the specimens. These findings suggest thatthe multistep magnetization anomaly in this system may be characterized by amagnetic correlation length.

Synthesis of fine particles of a geometrically frustrated spin-chain system, Ca3Co2O6, through a pyrophoric route and its magnetic behavior