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

Abstract

The 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.

arXiv comment7 pages, 2 figures, title and abstract include subscripts and special characters

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• Critical temperature and upper critical field of Li${}_2$Pd${}_{3-x}$Cu${}_x$B (x=0.0, 0.1, 0.2)superconductors
• Evolution of the Pauli spin-paramagnetic effect on the upper critical fields of K${}_x$Fe${}_{2-y}$Se${}_{2-z}$S${}_z$ single crystals
• Two-gap superconductivity: interband interaction in the role of external field
• Multiband Semimetallic Electronic Structure of Superconducting Ta2PdSe5
• Superconducting and magnetic properties of a new EuAsFeO0.85F0.15 superconductor
• Transport properties of Lix(NH3)yFe2(TezSe1-z)2 single crystals in the mixed state
• Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
• Upper critical fields in high-$T_{\mathrm{c}}$ superconductors
• Deviating band symmetries and many-body interactions in a model hole doped iron pnictide superconductor
• Magnetic behaviour of dirty multiband superconductors near the upper critical field
• Evidence for Pauli-limiting behaviour at high fields and enhanced upper critical fields near T_c in several disordered FeAs based Superconductors
• Superconducting dome in doped 2D superconductors with broken inversion symmetry
• Abrikosov flux-lines in two-band superconductors with mixed dimensionality
• Quantum Griffiths singularity in a three-dimensional superconductor to Anderson critical insulator transition
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity
• P-T phase diagram of iron arsenide superconductor NdFeAsO0.88F0.12
• Temperature dependence and limiting mechanisms of the upper critical field of FeSe thin films
• Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping
• DC-driven separation of fractional flux quanta in two-band superconductors
• Very high critical field and superior Jc-field performance in NdO0.82F0.18FeAs with Tc of 51 K
• Cooperative order in the weakly magnetic domain of LaFeAsO${}_{1-x}$F${}_x$ near the doping phase boundary
• Complete electronic phase diagram and enhanced superconductivity in fluorine-doped PrFeAsO1-xFx
• Upper critical field measurements up to 60 T in arsenic-deficient LaO_(0.9)F_(0.1)FeAs_(1-delta): Pauli limiting behaviour at high fields vs improved superconductivity at low fields
• One-step atmospheric pressure synthesis of the ground state of Fe based LaFeAsO1-d superconductor
• Single crystal growth of BaFe${}_{2-x}$Co${}_x$As${}_2$ without fluxing agent
• Critical fields and fluctuations determined from specific heat and magnetoresistance in the same nanogram SmFeAs(O,F) single crystal
• Flux pinning mechanism in NdFeAsO0.82F0.18 superconductor: Thermally activated flux flow and charge carrier mean free path fluctuation pinning
• Increase of critical current density in FeSe superconductor by strain effect
• Multiband behavior and non-metallic low-temperature state of K${}_{0.50}$Na${}_{0.24}$Fe${}_{1.52}$Se${}_2$
• In Vitro Studies of Cells Grown on the Superconductor PrOxFeAs
• High critical current density and low anisotropy in textured Sr1-xKxFe2As2 tapes for high field applications
• Tuning Superconductivity by Isovalent Antimony Substitution in PrFeAs(O,F)
• High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry