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- W2077117004 abstract "The magnetic behavior of the low-dimensional vanadium oxides ${mathrm{Sr}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9}$ and ${mathrm{Ba}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9}$ was investigated by means of magnetic susceptibility and specific heat measurements. In both compounds, the results can be very well described by an $S=frac{1}{2}$ Heisenberg antiferromagnetic chain with an intrachain exchange of $J=82$ and 94 K in ${mathrm{Sr}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9}$ and ${mathrm{Ba}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9},$ respectively. In ${mathrm{Sr}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9},$ antiferromagnetic ordering at ${T}_{N}=5.3mathrm{K}$ indicate a weak interchain exchange of the order of ${J}_{ensuremath{perp}}ensuremath{cong}2mathrm{K}.$ In contrast, no evidence for magnetic order was found in ${mathrm{Ba}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9}$ down to 0.5 K, pointing to an even smaller interchain coupling. In both compounds, we observe a pronounced Curie-like increase of $ensuremath{chi}(T)$ below 30 K, which we tentatively attribute to a staggered field effect induced by the applied magnetic field. Results of local density approximation calculations support the quasi-one-dimensional character and indicate that in ${mathrm{Sr}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{9},$ the magnetic chain is perpendicular to the structural one with the magnetic exchange being transferred through ${mathrm{VO}}_{4}$ tetrahedra." @default.
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- W2077117004 date "2003-05-22" @default.
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- W2077117004 doi "https://doi.org/10.1103/physrevb.67.174417" @default.
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