Magnetic resonance from the interplay of frustration and superconductivity

Details Magnetic resonance from the interplay of frustration and superconductivity Magnetic resonance from the interplay of frustration and superconductivity

2011-08-09

arxiv.org/abs/1108.2046v1

Phys. Rev. B 84, 180510(R) (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.84.180510

Motivated by the iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic stripe order with wavevector ${\bf Q}_{1} = (\pi,0)$ and $s^{+-}$ superconductivity. The onset of superconductivity leads to the appearance of a {\em magnetic} resonance near the wavevector ${\bf Q}_{2} = (0,\pi)$ where magnetic order is absent. This resonance is isotropic in spin space, unlike the excitations near ${\bf Q}_{1}$ where the magnetic Goldstone mode resides. We discuss several features which can be observed experimentally.

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