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Magnetoresistance (MR) has attracted tremendous attention for possibletechnological applications. Understanding the role of magnetism in manipulatingMR may in turn steer the searching for new applicable MR materials. Here weshow that antiferromagnetic (AFM) GdSi metal displays an anisotropic positiveMR value (PMRV), up to $\sim$ 415%, accompanied by a large negative thermalvolume expansion (NTVE). Around $T_\text{N}$ the PMRV translates to negative,down to $\sim$ -10.5%. Their theory-breaking magnetic-field dependencies [PMRV:dominantly linear; negative MR value (NMRV): quadratic] and the unusual NTVEindicate that PMRV is induced by the formation of magnetic polarons in 5$d$bands, whereas NMRV is possibly due to abated electron-spin scatteringresulting from magnetic-field-aligned local 4$f$ spins. Our results may open upa new avenue of searching for giant MR materials by suppressing the AFMtransition temperature, opposite the case in manganites, and provide apromising approach to novel magnetic and electric devices.

Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystal