Abstract
Neutron diffraction on the double perovskite Sr2YRuO6 with a quasi-face-centered cubic (FCC) lattice of Ru moments reveals planar magnetic correlations that condense into a partial long-range ordered state with coupled alternate antiferromagnetic (AFM) YRuO4 square layers coexisting with short-range correlations below T{N1}=32 K. A second transition to a fully ordered AFM state below T{N2}=24 K is observed. These observations are ascribed to the cancellation of the magnetic coupling between consecutive AFM square layers in FCC antiferromagnets, notably the simplest three-dimensional frustrated magnet model system. Inhomogeneous superconductivity in Sr2YRu_{1-x}Cu_{x}O6, reported in earlier works, may be nucleated in magnetically disordered YRu_{1-x}Cu_{x}O4 layers with strong spin fluctuations.
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