We report the structure, magnetic and electrical/thermal transport properties of the antiferromagnet MnSn. Importantly, the existence of the two antiferromagnetic states below (∼320 K) is confirmed by magnetism and electrical transport measurements. An unsaturated positive magnetoresistance up to 150% at ∼9 was observed at 5 K, whereas the magnetoresistance becomes negative in the whole range at high temperatures ( > 74 K). Systematic investigations of the Hall transport and thermoelectric properties reveal that the hole-type carriers are the majority carriers in MnSn. The kink around 320 K in the Seebeck coefficient originates from the effect of the antiferromagnetic phase on the band structure, while the pronounced peak around 231 K is attributed to the phonon-drag effect. The results suggest that the spin arrangement plays a vital role in the magnetic, electrical, and thermal transport properties in MnSn.
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