Magnetic properties of the superconducting state of iron-based superconductors

Kangjun Seo; Chen Fang; B. Andrei Bernevig; Jiangping Hu

doi:10.1103/PhysRevB.79.235207

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Magnetic properties of the superconducting state of iron-based superconductors

Kangjun Seo, Chen Fang, B. Andrei Bernevig, Jiangping Hu

DOI 10.1103/PhysRevB.79.235207 · Physical Review B

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Abstract

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 feature for the extended sx2y2-wave cos kx cos ky pairing symmetry. It is present in the pure superconducting (SC) state but weakens in the mixed SC and magnetically ordered state. We calculate the random-phase approximation correction to the NMR spin-relaxation rate 1/T1 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 the c axis observed in neutron scattering experiments is also an indirect evidence supporting the sx2y2 pairing symmetry.