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We present the results of magnetic measurements on Nd6Co(1.67)Si3, a compoundrecently reported to crystallize in a hexagonal structure (space group P6_3/m)and to undergo long range magnetic ordering below 84 K. The results reveal thatthe magnetism of this compound is quite complex with additional magneticanomalies near 50 and 20 K. There are qualitative changes in the isothermalmagnetization behavior with the variation of temperature. Notably, there is afield-induced spin reorientation as the temperature is lowered below 20 K. Afinding we stress is that this transition is discontinuous for 1.8K in thevirgin curve, but the first order character appears only after a field-cyclingfor a narrow higher temperature range near 5 K. Thus, this compound serves asan example for the stabilisation of first-order transition induced bymagnetic-field-cycling. The issues of 'Phase co-existence' and 'meta-stability'after a field-cycling at low temperatures in this compound are also addressed.

Magnetic anomalies in Nd6Co(1.67)Si3: Surprising first order transitions in the low-temperature isothermal magnetization