Large magnetoresistance in the magnetically ordered state as well as in the paramagnetic state near in an intermetallic compound,K. Sengupta, S. Rayaprol and E. V. Sampathkumaran
Tata Institute of Fundamental Research - Homi Bhabha Road Colaba, Mumbai-400005, India
received 12 October 2004; accepted in final form 22 November 2004
published online 24 December 2004
We report the response of electrical resistivity 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 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 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.
75.47.De - Giant magnetoresistance.
72.15.-v - Electronic conduction in metals and alloys.
75.50.-y - Studies of specific magnetic materials.
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