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- W2064416924 abstract "Neutron scattering has been used to reveal the nature of the magnetic ordering of the rare earth ions in 1–2–3, 2–4–8, 2–4–7 and 2-1–4 oxide superconductors. The interactions are found to be antiferromagnetic in nature and quite weak, leading to ordering temperatures which are a few degrees Kelvin or less. In the first three systems the separation of the rare earth ions is much larger along the c axis than along the ab directions, which renders these materials prototypical two-dimensional (2D) magnets. In the ErBa2Cu3O7 and DyBa2Cu3O7 systems, for example, a rod of scattering characteristic of 2D behavior is readily observed, while the order parameter obeys the exact solution of the S12, 2D Ising model. An extreme case of 2D behavior is found for the DyBa2Cu4O8 material, where a geometric cancellation of the already weak interactions occurs along the c axis, effectively decoupling the rare earth ab layers. The system thus exhibits no crossover to the 3D behavior usually found well below the ordering temperature, making it the best example of a 2D magnet known to date." @default.
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- W2064416924 title "Two-dimensional behavior of the rare earth ordering in oxide superconductors" @default.
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- W2064416924 doi "https://doi.org/10.1016/0925-8388(92)90337-9" @default.
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