Magnetic ordering of novel La3NiGe2-type R3CoGe2 compounds (R = Pr, Nd, Sm, Gd–Dy)

The novel R3CoGe2 compounds adopt the La3NiGe2-type structure (space group Pnma) with the following cell parameters: a = 1.1706(1), b = 0.42267(5), c = 1.1242(1)nm for Sm3CoGe2; a = 1.15845(5), b = 0.41905(2), c = 1.12088(5)nm for Gd3CoGe2; a = 1.14942(4), b = 0.41705(2), c = 1.11030(4)nm for Tb3CoGe2 and a = 1.1431(2), b = 0.41500(5), c = 1.1040(2)nm for Dy3CoGe2. The R3CoGe2 compounds undergo a ferrimagnetic type ordering (TCN = 150 K for …