Volume 69, Number 3, February 2005
|Page(s)||454 - 460|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||24 December 2004|
Large magnetoresistance in the magnetically ordered state as well as in the paramagnetic state near in an intermetallic compound,
Tata Institute of Fundamental Research - Homi Bhabha Road Colaba, Mumbai-400005, India
Accepted: 22 November 2004
We report the response of electrical resistivity ρ to the application of magnetic fields (H) up to 140 in the temperature interval 1.8–300 for the compound , ordering antiferromagnetically below 150. 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) in the magnetically ordered state due to a metamagnetic transition.
PACS: 75.47.De – Giant magnetoresistance / 72.15.-v – Electronic conduction in metals and alloys / 75.50.-y – Studies of specific magnetic materials
© EDP Sciences, 2005
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