Upper critical fields well above 100 T for the superconductor SmFeAsO0.85F0.15 with Tc=46 K
C. Senatore, R. Flükiger, M. Cantoni, G. Wu, R. H. Liu, X. H. Chen
DOI 10.1103/PhysRevB.78.054514 · Physical Review B
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Abstract
We report specific-heat measurements at magnetic fields up to 20 T on the recently discovered superconductor SmFeAsO0.85F0.15. The B−T diagram of a polycrystalline SmFeAsO0.85F0.15 sample with Tc=46 K was investigated. The temperature dependence of Bc2 was extracted from the specific-heat curves; the corresponding Bc2(T=0) value derived from the Werthamer-Helfand-Hohenberg formula being 150 T. Based on magnetization measurements up to 9 T, a first estimation of the field dependence of the inductive critical current Jc is given. Evidence for granularity is found. The presence of a peak effect is reported, suggesting a crossover in the vortex dynamics, in analogy to the behavior observed in high Tc cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO0.85F0.15 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | onset |
| SmFeAsO0.85F0.15 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45.5 | Pressure not reported | midpoint |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| La1-xSrxFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
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