Large magnetoresistance in the magnetically ordered state as well as in the paramagnetic state near 300 K in an intermetallic compound,Gd7Rh3

Abstract

We report the response of electrical resistivity $\rho$ to the application of magnetic fields (H) up to 140 kOe in the temperature interval 1.8-300 K for the compound, Gd7Rh3, ordering antiferromagnetically below 150 K. We find that there is an unusually large decrease of $\rho$ 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 $\rho$ is temperature dependent. In addition, this compound exhibits giant magnetoresistance behaviour at rather high temperatures (above 77 K) in the magnetically ordered state due to a metamagnetic transition.

Europhyics Letters, in press

References in corpus (3)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Enhanced electrical resistivity before Néel order in the metals, RCuAs${}_2$ (R= Sm, Gd, Tb and Dy
• Large magnetoresistance anomalies in Dy7Rh3

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• Complex and strongly anisotropic magnetism in the pure spin system EuRh2Si2
• Magnetic behavior of EuCu2As2: Delicate balance between antiferromagnetic and ferromagnetic order
• An anomalous magnetic phase transition at 10 K in Nd7Rh3
• Magnetic frustration and paramagnetic state transport anomalies in Ho4RhAl and Er4RhAl: Possible test cases for newly identified roles of itinerant electrons