Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-11
PhysRevB.79.235207 2009
Physics
Condensed Matter
Superconductivity
8 pages, 6 pages
Scientific paper
We show that features of the dynamical spin susceptibility can unambiguously distinguish between different pairing symmetries of the superconducting state in iron-based superconductors. A magnetic resonance is a unique feature for the extended $s_{x^2y^2}$-wave $\cos k_x\cos k_y$ pairing symmetry. It is present in the pure superconducting (SC) state, but weakens in the mixed SC and magnetically ordered state. We calculate the the RPA correction to the NMR spin relaxation rate $1/T_1$ and the Knight shift in the above states and show a good agreement with experimental results. Moreover, we argue that the energy dispersion of the magnetic resonance along c axis observed in neutron scattering experiments is also an indirect evidence supporting the $s_{x^2y^2}$ pairing symmetry.
Bernevig Andrei B.
Fang Chen
Hu Jiangping
Seo Kangjun
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