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| Copper oxides with atomic arrangements, such as quasione-dimensional S51/2 Heisenberg spin chains or spin ladders, have been attracting a great deal of interest because of their unique low temperature properties such as a spin singlet ground state, spin gap, and antiferromagnetism.1 Whether a quasi-one-dimensional ~1D! spin-1/2 chain compound shows a low temperature transition to 3D magnetic ordering or a spin-Peierls instability or a spin gap depends on the exact nature of quantum effects controlled by the intrachain and interchain exchange interactions. |
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