Vortex dynamics and irreversibility line in optimally doped SmFeAsO${}_{0.8}$F${}_{0.2}$ from ac susceptibility and magnetization measurements

Abstract

Ac susceptibility and static magnetization measurements were performed in the optimally doped SmFeAsO${}_{0.8}$F${}_{0.2}$ superconductor. The field - temperature phase diagram of the superconducting state was drawn and, in particular, the features of the flux line lattice derived. The dependence of the intra-grain depinning energy on the magnetic field intensity was derived in the thermally-activated flux creep framework, enlightening a typical 1/H dependence in the high-field regime. The intra-grain critical current density was extrapolated in the zero temperature and zero magnetic field limit, showing a remarkably high value $J_{c0}(0)\sim 2\cdot 10^7$ A/cm${}^2$, which demonstrates that this material is rather interesting for the potential future technological applications.

6 pages, 6 figures

References in corpus (12)

• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Magnetism in Fe-based superconductors
• High magnetic field scales and critical currents in SmFeAs(O,F) crystals: promising for applications
• Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides
• Flux pinning in (1111) iron-pnictide superconducting crystals
• Magnetic-superconducting phase boundary of SmFeAsO${}_{1-x}$F${}_x$ studied via muon spin rotation: Unified behavior in a pnictide family
• Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
• Caloric Determination of the Upper Critical Fields and Anisotropy of NdFeAsO1-xFx Single Crystals
• Local moment versus Kondo behavior of the 4f-electrons in rare-earth iron oxypnictides
• Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
• Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1-xFx
• Coupling between 4f and itinerant electrons in SmFeAsO1-xFx (0.15 < x < 0.2) superconductors: an NMR study

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