Causa, M. T., S. M. Dutrus, C. Fainstein, G. Nieva, R. Sanchez, L. B. Steren, M. Tovar, R. Zysler, S. B. Oseroff, D. C. Vier et al. "Magnetic ordering in dilute GdxEu1−xBa2Cu3O7−δ superconductors." Physica C: Superconductivity 153 (1988): 188–189.
Abstract: We have measured the specific heat of GdxEu1−xBa2Cu3O7−δ (0 ≤ × ≤ 1). The data show a λ-type anomaly at high concentrations and a broad Schottky type anomaly at intermediate and low concentrations. We compare this behavior with theoretical predictions for a 2-dimensional Ising system.
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