Upper critical fields well above 100 T for the superconductor SmFeAsO${}_{0.85}$F${}_{0.15}$ with T${}_c$ = 46 K

Abstract

We report specific heat measurements at magnetic fields up to 20 T on the recently discovered superconductor SmFeAsO${}_{0.85}$F${}_{0.15}$. The B-T diagram of a polycrystalline SmFeAsO${}_{0.85}$F${}_{0.15}$ sample with T${}_c$ = 46 K was investigated. The temperature dependence of B${}_{c2}$ was extracted from the specific heat curves, the corresponding B${}_{c2}$(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 J${}_c$ 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 behaviour observed in high T${}_c$ cuprates.

Accepted for publication in Physical Review B

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• Magnetization Relaxation and Collective Vortex Pinning in the Fe-Based Superconductor SmFeAsO_0.9F_0.1
• Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides
• Upper and lower critical fields in NdFeAs(O,F) single crystals : a study by Hall probe magnetization and specific heat
• Thermal properties of SmFeAs(O1-xFx) as probe of the interplay between electrons and phonons
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