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Transition metal compounds with complex crystal structures tend todemonstrate interesting magnetic coupling resulting in unusual magneticproperties. In this work, the structural and magnetic characterization of asingle crystal of the Ni-Mn-Si based G-phase compound, Mn$_6$Ni$_{16}$Si$_7$,grown by the Czochralski method, is reported. In this structure isolatedoctahedral Mn$_6$ clusters form a f.c.c. lattice. As each octahedron consistsof eight edge-sharing equilateral triangles, the possibility for geometricfrustration exists. Magnetization and specific heat measurements showed twomagnetic phase transitions at 197 K and 50 K, respectively. At 100 K neutrondiffraction on powder samples shows a magnetic structure with k = (001) inwhich only four of the six Mn spins per cluster order along $<100>$ directionsgiving a two dimensional magnetic structure consistent with intra-clusterfrustration. Below the 50 K phase transition the Mn spins cant away from$<100>$ directions and a weak moment develops on the two remaining Mnoctahedral sites.

Magnetic and structural studies of G-phase compound Mn$_6$Ni$_{16}$Si$_7$