Novel organic-inorganic layered oxide with spin ladder structure

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Structural analysis of a layered manganese tungstate diaminoalkane hybrid series suggests that this compound forms a spin-5/2 spin-ladder structure. We use X-ray diffraction, electron microscopy and x-ray absorption spectroscopy results to infer the structure. DC magnetization of the manganese compound and a possible copper analogue appear to show that the manganese system behaves like 1-dimensional antiferromagnetic Heisenberg chains (i.e. J∥ ≫ J⊥) while the copper system is fitted well by a S = 1/2 spin ladder model, giving the parameters g = 1.920 ± 0.008, J∥/kB = -0.3 ± 1.4K; J⊥/kB = 213.6 ± 1.1K. The ability to tune adjacent inorganic layers of the hybrid materials by altering the length of the organic `spacer' molecules gives enormous promise for the use of these materials, especially when doped, to provide a greater understanding of spin ladder systems.