Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-07
Phys. Rev. B 83, 174514 (2011)
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures
Scientific paper
10.1103/PhysRevB.83.174514
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.
Carretta Pietro
Palenzona Andrea
Prando Giacomo
Putti Marina
Renzi Roberto de
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