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A well crystallized sample of EuAu 2 Ge 2  was synthesized by arc-melting of the elements. The structure was refined on the basis of single crystal X-ray diffracto meter data: ThCr 2 Si 2  type,  I 4/ mmm ,  a  = 447.3(1),  c  = 1034.0(4) pm,  wR 2 = 0.0575, 148  F  2  values and 9 variables. The gold atoms have tetrahedral germanium coordination (261 pm Au—Ge). These AuGe 4/4  tetrahedra share four common edges, leading to layers which are connected via Ge—Ge bonds (247 pm). The europium atoms fill cages of coordination number 16 within the [Au 2 Ge 2 ]  δ –  polyanion. Temperature dependent susceptibility measurements show a magnetic moment of 7.79(1) μ  B /formula unit. Together with the  151  Eu Mössbauer spectroscopic data (isomer shift of –11.43 mm/s at 77 K), the magnetic data point to stable divalent europium. EuAu 2 Ge 2  orders antiferromagnetically at  T  N1  = 5.5(1) K, followed by a spin-reorientation at  T  N2  = 3.5 K. A metamagnetic step occurs around 20 kOe in the 4 K magnetization isotherm.

Structure and properties of the 5.5 K antiferromagnet EuAu 2 Ge 2