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Present work reports a detailed investigation on the magnetoresistance andmagnetocaloric behavior of Ni and Cr-doped Mn$_5$Si$_3$ alloys with generalformula Mn$_{5-x}$A$_x$Si$_3$ (where A = Ni/Cr; $x$ = 0, 0.05, 0.1 and 0.2).Both pure (undoped) and doped alloys show a reasonably large amount ofmagnetoresistance (MR). Doping at Mn-site, both by Ni and Cr, results in amonotonic decrease in MR values. Magnetocaloric effect (MCE), on the otherhand, is found to be interesting, and all the alloys show both conventional andinverse MCE around the magneto-structural transition temperature. Among the twotypes of MCE observed, the inverse MCE is found to decrease with increasingdoping concentration and consistent with the MR behavior, whereas dopingresults in a significant increase in conventional MCE values.

Multifunctional behavior of Mn-site doped antiferromagnetic Mn$_5$Si$_3$ alloys