Determination of Ru valence from x-ray absorption near-edge structure in RuSr2GdCu2O8-type superconductors
R. S. Liu, L.-Y. Jang, H.-H. Hung, J. L. Tallon
DOI 10.1103/PhysRevB.63.212507 · Physical Review B
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Abstract
The Ru valence in the antiferromagnetic and ferromagnetic ruthenocuprate superconductors RuSr2RCu2O8 (Ru-1212), with R=Eu, Gd, and Gd0.6Dy0.4, has been studied using Ru LIII-edge x-ray absorption near-edge structure spectroscopy. Comparison with reference materials Sr2RuO4 and Sr2RuGdO6 in which Ru is tetravalent and pentavalent, respectively, reveals the strong likelihood of mixed valence in Ru-1212 with 40–50% Ru4+ and 60–50% Ru5+, depending upon specific substitutions. This introduces several possibilities for the nature of the magnetic ordering in these compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RuSr2EuCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | Pressure not reported | onset |
| RuSr2Gd0.6Dy0.4Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58 | Pressure not reported | onset |
| RuSr1.6Ba0.4GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | Pressure not reported | onset |
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