Abstract
The structural, magnetic, and electrical dc transport properties of Co-doped hexagonal Mn5Si3 alloys of nominal compositions Mn5−xCoxSi3 (x = 0.1, 0.3, 0.5) have been investigated. The doped alloys were found to crystallize in hexagonal D88 type structure. The shift in the collinear to non-collinear antiferromagnetic transition temperature towards the lower temperature is found to be slow with increasing Co-concentration compare to the Ni-doped alloys. However, both Ni and Co-doping provide positive chemical pressure in the system. Slower change in the valence electron concentration (e∕a ratio) with Co-doping plays the crucial role behind such observation. Incomplete field-induced non-collinear to collinear antiferromagnetic transition in the Co-doped alloys is another critical observation of the present work. A possible explanation for such behavior has been mooted in terms of local minimas’ disappearance between parent and product phases in the free energy landscape. Besides, various vital properties of Mn5Si3 alloy like, inverted hysteresis behavior, magnetocaloric effect, and magnetoresistance are found to be significantly affected by Co-doping.
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