Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-23
Phys. Rev. B 78, 134512 (2008)
Physics
Condensed Matter
Superconductivity
12 pages, 9 figures. References added, the formula for the susceptibility corrected
Scientific paper
10.1103/PhysRevB.78.134512
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 $T_c$.
Chubukov Andrey V.
Efremov Dmitry
Eremin Ilya
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