Abstract
The magnetic properties of cobalt-based oxypnictides SmCoAsO are investigated by measuring magnetization, magnetoresistance and specific heat. The compound undergoes a ferromagnetic (FM) transition around Tc of 80 K, and a ferromagnetic to antiferromagnetic (AFM) transition below TN1 of about 45 K, and finally an AFM order of Sm ion at TN2 of 5.6 K. The weak FM order should originate from the itinerant 3d electrons of Co ions in the CoAs layers. We propose that the magnetic structure should be A-type AFM, which means that the FM order remains within the CoAs layer and the magnetic coupling between the CoAs layers becomes AFM below TN1 of 45 K. The AFM coupling between the CoAs layers should be very weak. A magnetic field µ0H of about 2 T may cause an AFM-FM metamagnetic transition. A rich magnetic phase diagram is established and the interplay between the 3d electrons of Co ions and 4f electrons of Sm ions is discussed.
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