Evidence for a bulk Meissner state in the ferromagnetic superconductor RuSr2GdCu2O8 from dc magnetization
C. Bernhard, J. L. Tallon, E. Brücher, R. K. Kremer
DOI 10.1103/PhysRevB.61.R14960 · Physical Review B
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Abstract
From magnetization measurements we provide evidence that the ferromagnetic superconductor RuSr2GdCu2O8 with Tc≈45K and TM≈135K exhibits a sizeable diamagnetic signal at low temperature (T<Tms=30K) and low magnetic field (Hext<30<30>Oe), corresponding to a bulk Meissner phase. We argue that a recent negative report [C. W. Chu et al., cond-mat/9910056 (unpublished)] regarding the Meissner effect in Ru-1212 can be explained by impurity scattering or grain-size effects. At intermediate temperatures, Tms<T<Tc, we observe unique thermal hysteresis effects which are characteristic of a spontaneous vortex phase.
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. | 45 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | onset |
| RuSr2GdCu2.94Zn0.06O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
| RuSr2(Gd,Ce)2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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