Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide
  Superconductors from a two-orbital model

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Abstract

We study theoretically the coexistence of the spin-density-wave (SDW) and superconductivity in electron-doped iron-pnictide superconductors based on the two orbital model and Bogoliubov-de Gennes equations. The phase diagram is mapped out and the evolution of the Fermi surface as the doping varies is presented. The local density of states (LDOS) has also been calculated from low to high doping. We show that the strength of the superconducting coherent peak at the positive energy gets enhanced and the one at the negative energy is suppressed by the SDW order in the underdoped region. Several features of our results are in good agreement with the experiments.

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Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K.

Yoichi Kamihara, Takumi Watanabe, Masahiro Hirano … (2008)

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Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors

D. Efremov, I Eremin, A Chubukov (2008)

We analyze antiferromagnetism and superconductivity in novel \(Fe-\)based superconductors within the itinerant model of small electron and hole pockets near \((0,0)\) and \((\pi,\pi)\). We argue that the effective interactions in both channels logarithmically flow towards the same values at low energies, {\it i.e.}, antiferromagnetism and superconductivity must be treated on equal footings. The magnetic instability comes first for equal sizes of the two pockets, but looses to superconductivity upon doping. The superconducting gap has no nodes, but changes sign between the two Fermi surfaces (extended s-wave symmetry). We argue that the \(T\) dependencies of the spin susceptibility and NMR relaxation rate for such state are exponential only at very low \(T\), and can be well fitted by power-laws over a wide \(T\) range below \(T_c\).