Oxygen isotope effects on the critical and Curie temperatures and Raman modes in the ferromagnetic superconductor RuSr2GdCu2O8
D. J. Pringle, J. L. Tallon, B. G. Walker, H. J. Trodahl
DOI 10.1103/PhysRevB.59.R11679 · Physical Review B
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Abstract
The effect of oxygen isotopic substitution on transition temperature Tc, the Curie temperature TM, and Raman modes is investigated in the ferromagnetic superconductor RuSr2GdCu2O8. A large positive oxygen isotope effect, αTc=1.6, is observed in the zero resistance Tc value for as-prepared samples but a much smaller value αTc=0.12±0.04 is found in the true Tc, where the superconductivity order parameter is established as signified by the rapid rise in dρ/dT. Such a value is in keeping with other underdoped high-Tc superconductor cuprates. A rather small (αFM≈0.02) oxygen isotope effect is observed in the ferromagnetic transition. Raman modes for this material are identified by inspection of the spectra with progressive 18O exchange, cation substitution, and structural considerations.
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. | 46 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | zero_resistance |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | zero_resistance |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | onset |
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