Magnetic resonance from the interplay of frustration and superconductivity

Abstract

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 ${\mathbf{Q}}_1=(\pi ,0)$ and $s^{+-}$ superconductivity. The onset of superconductivity leads to the appearance of a {\em magnetic} resonance near the wavevector ${\mathbf{Q}}_2=(0,\pi )$ where magnetic order is absent. This resonance is isotropic in spin space, unlike the excitations near ${\mathbf{Q}}_1$ where the magnetic Goldstone mode resides. We discuss several features which can be observed experimentally.

5 pages, 3 figures

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Cited by in corpus (13)

• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
• Gap nodes induced by coexistence with antiferromagnetism in iron-based superconductors
• Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs
• Superconducting pairing in the spin-density-wave phase of iron pnictides
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Spin Resonance and Magnetic Order in an Unconventional Superconductor
• Suppression of low-energy longitudinal spin-excitations in Co-underdoped BaFe2As2
• Experimental elucidation of the origin of the `double spin resonances' in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
• Orbital selective neutron spin resonance in underdoped superconducting NaFe${}_{\text{0.985}}$Co${}_{\text{0.015}}$As
• Neutron spin resonance as a probe of superconducting gap anisotropy in partially detwinned electron underdoped NaFe${}_{0.985}$Co${}_{0.015}$As