Abstract
Magnetic transitions and magnetoresistance ofHfFe6Ge6-type Y1-xDyxMn6Sn6(x = 0.2 and 0.3) have been investigated in the temperaturerange of 5-380 K. It was found that the strong exchange interactionbetween the Dy and Mn sublattices results in incomplete ferromagnetismat low temperatures. At higher temperatures, the metamagnetictransition from an antiferromagnetic state to a ferrimagnetic state canbe induced by a fairly small threshold field or by increasingtemperature. The magnetic transition is accompanied by a largemagnetoresistance effect of about -29% and -16% at 5 K forx = 0.2 and 0.3, respectively.
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