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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Causa, M. T., C. Fainstein, G. Nieva, R. Sánchez, L. B. Steren, M. Tovar, R. Zysler, D. C. Vier, S. Schultz, S. B. Oseroff et al. "Crystal Field Interaction and Magnetic Order in GdBa2Cu3O7." In Progress in High Temperature Superconductivity, edited by J. L. Heiras. Vol. 5. N.J.: World Scientific, 1988.
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Sanchez, R. D., M. T. Causa, J. G. Sereni, M. Vallet-Regi, M. J. Sayaguez, and J. M. Gonzalez-Calbet. "Specific heat, magnetic susceptibility and electrical resistivity measurements on LaNiO3." Journal of Alloys and Compounds 191, no. 2 (1993): 287–289.
Abstract: Measurements of specific heat, magnetic susceptibility and electrical resistivity on LaNiO3 are reported. No evidence of magnetic ordering or metal-insulator transitions is found. From the measured electronic specific heat parameter γ and the Pauli susceptibility χP, a Stoner enhancement parameter is derived. Comparison with band structure calculations performed by other workers is also made.
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Tovar, M., J. G. Sereni, P. Pedrazzini, A. Caneiro, F. Prado, A. Butera, and M. T. Causa. "Magnetization and specific heat of La doped Sr2FeMoO6." JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 272 (2004): 857–858.
Abstract: We present high-temperature magnetization and low-temperature specific heat measurements performed on the electron doped double perovskite Sr1.7La0.3FeMoO6. We have obtained the electronic contribution to C-p, gamma = 11.5(5) mJ/mol K-2. The electronic susceptibility, derived from the magnetic measurements in the paramagnetic regime (T > T-c = 390K), was chi(e)(0) =(4.9 +/- 1.5) x 10(-4) emu/mol. Anti ferromagnetic coupling between localized and itinerant moments was inferred from the data, with a coupling constant lambda = -(475 +/- 50)mol/emu, that results in a ferromagnetic-like Curie-Weiss susceptibility with Theta = 390(5) K. These results are compared with those obtained for the undoped material. (C) 2003 Published by Elsevier B.V.
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