Large magnetoresistance in the magnetically ordered state as well as in the paramagnetic state near

We report the response of electrical resistivity ρ to the application of magnetic fields (H) up to 140$\un{kOe}$ in the temperature interval 1.8–300$\un{K}$ for the compound $\chem{Gd_{7}Rh_{3}}$, ordering antiferromagnetically below 150$\un{K}$. We find that there is an unusually large decrease of ρ for moderate values of H in the close vicinity of room temperature, uncharacteristic of paramagnets, with the magnitude of the magnetoresistance increasing with decreasing temperature as though the spin-order contribution to ρ were temperature dependent. In addition, this compound exhibits giant-magnetoresistance behaviour at rather high temperatures (above 77$\un{K}$) in the magnetically ordered state due to a metamagnetic transition