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On a high energy scale the CuO
4
plaquettes are isolated. On a low energy scale there are oxygen-oxygen hoppings to neighboring plaquettes, and the material is 3-dimensionally coupled, whence a rather high Neel temperature and a large moment.
[J. L. Garcia-Munos et al. J. Phys.: Condens. Matter 2, 2205 (1990)]
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