Josephson plasma in RuSr2GdCu2O8
H. Shibata
DOI 10.1103/PhysRevB.65.180507 · Physical Review B
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Abstract
Josephson plasma in RuSr2GdCu2O8, Ru1−xSr2GdCu2+xO8 (x=0.3), and RuSr2Eu2−xCexCu2O10 (x=0.5) compounds is investigated by the sphere resonance method. The Josephson plasma is observed in a low-frequency region (around 8.5 cm−1 at T≪Tc) for ferromagnetic RuSr2GdCu2O8, while it increases to 35 cm−1 for nonferromagnetic Ru1−xSr2GdCu2+xO8 (x=0.3), which represents a large reduction in the Josephson coupling at ferromagnetic RuO2 block layers. The temperature dependence of the plasma does not shift to zero frequency (i.e., jc=0) at low temperatures, indicating that there is no transition from the zero phase to the π phase in these compounds. The temperature dependence and the oscillator strength of the peak are different from those of other nonmagnetic cuprates, and the origins of these anomalies are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | zero_resistance |
| Ru1-xSr2GdCu2+xO8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 64 | Pressure not reported | onset |
| Ru1-xSr2GdCu2+xO8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56 | Pressure not reported | zero_resistance |
| RuSr2Eu2-xCexCu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | onset |
| RuSr2Eu2-xCexCu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | zero_resistance |
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