Field-induced suppression of charge density wave in GdNiC2

We report the specific heat, magnetic, magnetotransport, and galvanomagnetic properties of polycrystalline ${\mathrm{GdNiC}}₂$. In the intermediate temperature region above ${T}_N=20\phantom{\rule{4pt}{0ex}}\mathrm{K}$, we observe large negative magnetoresistance due to Zeeman splitting of the electronic bands and partial destruction of a charge density wave ground state. Our magnetoresistance and Hall measurements show that at low temperatures a magnetic field-induced transformation from antiferromagnetic order to a metamagnetic phase results in the partial suppression of the CDW.