Crystal growth, structure, and physical properties of Ln 2MGa12 (Ln = La, Ce; M = Ni, Cu)

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Single crystals of Ln2MGa12 (Ln = La, Ce; M = Ni, Cu) have been synthesized using Ga flux and their structures determined by single-crystal X-ray diffraction. The Ln2MGa12 (Ln = La, Ce; M = Ni, Cu), which is isostructural to Ce2PdGa12, crystallizes in the tetragonal P4/nbm (No. 125, origin choice 2) space group, with Z = 2 and lattice parameters a ≈ 6.1 Å and c ≈ 15.3 Å. Ce2NiGa12 orders antiferromagnetically at 10 K and specific heat measurements suggest it is a moderate heavy-fermion system with y ≈ 191 mJ mol-1 K-2. Magnetic susceptibility data show paramagnetic behavior down to 2 K for Ce2CuGa12, whereas specific heat data suggest a magnetic transition below 1.8 K, with a moderately enhanced γ-value of 69 mJ mol-1 K-2. Metallic behavior is observed below 300 K for each compound. A large positive and nonsaturating magnetoresistance up to 216% at a field (μ0H) of 9 T is also observed for La2NiGa12. We present the crystal structures and physical properties of the Ln2MGa12 (Ln = La, Ce; M = Ni, Cu) series. © 2008 American Chemical Society.

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Chemistry of Materials

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