Synthesis, structure, and magneto-transport of LnNii 1-xSb 2 (Ln = Y, Gd-Er)

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Single crystals of the ternary antimonides LnNi 1-xSb 2 (Ln = Y, Gd-Er; x ∼ 0.4) have been grown from antimony flux.X-ray diffraction experiments reveal that these compounds crystallize in the tetragonal space group P4/nmm (No. 129) with Z = 2. Lattice parameters are a ∼4.3 Å and c ∼ 9.3 Å. Adopting the HfCuSi 2 structure type, these compounds are layered and consist of Ln-capped Sb square nets and NiSb 4 tetrahedra arranged in an anti-PbO fashion. The LnNi 1-xSb 2 compounds show antiferromagnetic ordering and field-dependent magnetization data are also presented. Transport measurements indicate metallic behavior and, most interestingly, positive magnetoresistance for each compound, with large positive magnetoresistance [MR(%) = (ρ H - ρ 0)/ρ 0 × 100] above 100% for the Y-, Dy-, and Ho-analogues at 3 K and 9 T. © 2005 American Chemical Society.

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Chemistry of Materials

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