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Synthesis, Structure, and Magnetoresistance of SmPd2Ga2

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posted on 02.10.2003, 00:00 authored by Willa M. Williams, Robin T. Macaluso, M. Moldovan, D. P. Young, Julia Y. Chan
Single crystals of a new ternary compound, SmPd2Ga2, have been synthesized by flux growth methods. This compound adopts a tetragonal space group I4/mmm, Z = 2, with lattice parameters a = 4.2170(3) Å and c = 10.4140(3) Å. The crystal structure is composed of layers of isolated Sm atoms and layers of PdGa4 edge-sharing tetrahedra alternating along the c-axis. The sample is metallic (dρ/dT > 0) with a weak temperature dependence above 100 K. This new material has physical properties similar to those of other Sm intermetallics and has, most notably, a large positive magnetoresistance at low temperatures. Magnetic measurements indicate that SmPd2Ga2 is ferromagnetic with Tc 5 K.

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