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Title

Upper critical fields well above 100 T for the superconductor SmFeAsO0.85F0.15 with Tc=46 K

Authors
Wu, G.
Liu, R. H.
Chen, X. H.
Published in Physical Review. B, Condensed Matter. 2008, vol. 78, no. 5
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.
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Research group Groupe Senatore
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SENATORE, Carmine et al. Upper critical fields well above 100 T for the superconductor SmFeAsO0.85F0.15 with Tc=46 K. In: Physical Review. B, Condensed Matter, 2008, vol. 78, n° 5. https://archive-ouverte.unige.ch/unige:36265

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Deposited on : 2014-05-05

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