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- W1993288963 abstract "One-dimensional quantum antiferromagnetism has been found in a tetragonal spinel oxide, GeCu 2 O 4 . Actually the temperature dependence of magnetic susceptibility exhibiting a broad maximum around 80 K can be well-described as that of S =1/2 Heisenberg antiferromagnetic chains with J / k B =135 K. Cooperation of spin frustration caused by the triangular arrangement of the cupric ions at octahedral sites and the Jahn-Teller elongation of the CuO 6 octahedra along the c axis seems to lead to the formation of magnetically isolated CuO 2 chains made of edge-sharing CuO 4 squares. However, a small drop in susceptibility and also a sharp spike in specific heat suggesting the occurrence of long-range antiferromagnetic ordering are observed at 33 K. The effects of Si-for-Ge substitution and Mg-for-Cu substitution are also reported." @default.
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- W1993288963 date "2000-05-15" @default.
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- W1993288963 title "Spin-1/2 Heisenberg Antiferromagnetic Chains in the Frustrated Spinel Lattice of GeCu<sub><b>2</b></sub>O<sub><b>4</b></sub>" @default.
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- W1993288963 doi "https://doi.org/10.1143/jpsj.69.1477" @default.
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