Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11

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dc.creatorHunte, F.
dc.creatorJaroszynski, J.
dc.creatorGurevich, A.
dc.creatorLarbalestier, D. C.
dc.creatorJin, R.
dc.creatorSefat, A. S.
dc.creatorMcGuire, M. A.
dc.creatorSales, B. C.
dc.creatorChristen, D. K.
dc.creatorMandrus, D.
dc.date2008-04-03
dc.date.accessioned2026-07-07T09:45:47Z
dc.date.available2026-07-07T09:45:47Z
dc.descriptionThe ongoing search for new superconductors has recently yielded a new family of oxypnictides composed of alternating La_2O_{2-x}F_x and Fe_2As_2 layers [1-4] with transition temperatures T_c of 25-28 K, which can be raised to 40-43 K by replacing La with Ce [5] or Sm [6] or to 52 K by replacing La with Nd and Pr [7, 8]. Recent experiments and band structure calculations have suggested an unconventional multiband superconductivity in the layers of paramagnetic Fe ions, which would normally destroy superconductivity in the traditional mechanism of the s-wave Cooper pairing. Here we report very high-field resistance measurements up to 45T, which show a remarkable enhancement of the upper critical fields B_c2 at low temperatures, as compared to those expected from the already high slopes of dB_c2/dT ~ 2T/K near T_c . The deduced B_c2(0) ~ 63-65 T exceeds the paramagnetic limit, consistent with strong coupling and important two-band effects in LaFeAsO_0.89F_0.11. We argue that oxypnictides are emerging as a new class of high-field superconductors surpassing the B_c2 of Nb_3Sn, MgB_2, and the Chevrel phases and perhaps approaching the 100T field benchmark of the high-T_c cuprates.
dc.description7 pages, 2 figures, title and abstract include subscripts and special characters
dc.identifierhttps://arxiv.org/abs/0804.0485
dc.identifierhttp://arxiv.org/abs/0804.0485
dc.identifierNature 453, 903-905 (12 June 2008)
dc.identifierdoi:10.1038/nature07058
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163310
dc.subjectSuperconductivity
dc.titleVery High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
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