Investigation of the effect of Ni substitution on the physical properties of Ce(Cu1-xNix)ySb2

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Single crystals of Ce(Cu1-xNix)ySb 2 (x = 0, 0.25, 0.37, 0.46; y∼0.7) were synthesized using a flux growth method and crystallize in the tetragonal P4/nmm space group with lattice parameters of a∼4.4 and c∼9.8. The effects of Ni substitution on the magnetic and electrical transport properties are investigated. Three of the analogues (with x = 0, 0.37, and 0.46) show antiferromagnetic behavior while the x = 0.25 sample is paramagnetic down to 2K. Field-dependent magnetization data as well as resistivities are presented. Positive magnetoresistance behaviors above 70% are observed for the analogues with x = 0, 0.37, and 0.46 at 3K and up to 9T. The La analogue La(Cu0.2Ni0.8)ySb 2, has been synthesized and large, positive magnetoresistance of ∼300% is observed at 3K and 9T. © 2009 IOP Publishing Ltd.

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Journal of Physics Condensed Matter

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