ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report the results obtained by x-ray, dc magnetization, ac magnetic susceptibility, microwave magnetic absorption, and electron paramagnetic resonance of the magnetic and superconductive properties of a large series of compounds of the form A2−x−yBxCeyCuO4 with A,B≡La, Pr, Nd, Sm, Eu, Gd, and Y. For y=0 antiferromagnetic ordering of the copper moments is present at TN≈280 K for all the compounds formed in the tetragonal T' phase. Weak ferromagnetism (WF) associated with the canting of the copper moments is observed in all the compounds with a lattice parameter, a〈a0, a0≈3.91 A(ring), regardless of the rare-earth (R) ions present in the system. Superconductivity is observed only in the Ce-doped compounds with a(approximately-greater-than)a1, a1≈3.92 A(ring). The maximum onset temperature Tc is found for a≈3.95 A(ring). A phase diagram was obtained by varying the lattice parameter size as a function of A, B, and x. The correlation between the appearance of WF in the undoped compounds and the disappearance of superconductivity in the Ce-doped systems is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356982
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