Abstract
A Mössbauer study has been made on57Fe ions substituted into the Cu(1) site of REBa2Cu3−x Fe x O7+δ (RE=Y, Er, Dy, Gd;x=0.15, 0.30). At low temperature, the iron atoms antiferromagnetically order with a transition temperature which is dependent on the Fe concentration. The temperature dependence of the magnetic subspectra representing Fe ions with various local oxygen environments in YBa2Cu3−x Fe x O7+δ and ErBa2Cu3−x Fe x O7+δ fit a 2D-Ising model with a ratio of the anisotropic exchange between the two directions on the order of 0.5–1.0(10−3) for the Y-compounds and on the order of 1 for the Er-compounds. The magnitude of the local dopant magnetization is related to a short-range chemical order which determines the magnetic chain size and defines the correlation lengths. For the Y-compound, the order is quasi-1D with strong intrachain but very weak interchain coupling. For the Er-compounds, the magnetic coupling is Ising 2D. The strong fluctuation behavior expected in low dimensional systems above and belowT N is observed via characteristic relaxation in the Mössbauer linewidth nearT N. For both the Dy- and Gd-compounds, the magnetic order is 3D. The magnitude of the rare-earth magnetic moments appears to affect the character of the magnetic interaction in the Cu(1)-site. However, a Mössbauer effect measurement at155Gd nuclei in GdBa2Cu2.85Fe0.15O7+δ (T N(Fe)∼14 K) shows paramagnetic behavior at 4.9 K.
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Kimball, C.W., Dabrowski, B., Liang, Y. et al. Mössbauer studies of magnetic behavior of 3d-doped REBa2Cu3−x Fe x O7+δ (RE=Y, Er, Dy, Gd). Hyperfine Interact 72, 153–172 (1992). https://doi.org/10.1007/BF02398862
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DOI: https://doi.org/10.1007/BF02398862