Spin excitations in layered antiferromagnetic metals and superconductors

Abstract

The proximity of antiferromagnetic order in high-temperature superconducting materials is considered a possible clue to the electronic excitations which form superconducting pairs. Here we study the transverse and longitudinal spin excitation spectrum in a one-band model in the pure spin density wave (SDW) state and in the coexistence state of SDW and the superconductivity. We start from a Stoner insulator and study the evolution of the spectrum with doping, including distinct situations with only hole pockets, with only electron pockets and with pockets of both types. In addition to the usual spin-wave modes, in the partially gapped cases we find significant weight of low-energy particle-hole excitations. We discuss the implications of our findings for neutron scattering experiments and for theories of Cooper-pairing in the metallic SDW state.

(14 pages, 6 figures)

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• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Ground State Phase Diagram of the $t$-$t^{\prime }$-$J$ model
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Coexistence of incommensurate magnetism and superconductivity in the two-dimensional Hubbard model
• The dynamical vertex approximation for many-electron systems with spontaneously broken SU(2)-symmetry
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Superconducting phase diagram of itinerant antiferromagnets
• Spin Resonance and Magnetic Order in an Unconventional Superconductor
• Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
• Doping asymmetry of superconductivity coexisting with antiferromagnetism in spin fluctuation theory
• Dynamical response theory of interacting Majorana fermions and its application to generic Kitaev quantum spin liquids in a field
• Static spin susceptibility in magnetically ordered states
• The commensurate magnetic excitations induced by band-splitting and Fermi surface topology in n-type Cuprates
• Anomaly of longitudinal spin susceptibility at superconducting instability inside a magnetic phase
• Geometrical torque on magnetic moments coupled to a correlated antiferromagnet
• Antiferromagnetic magnons and local anisotropy: dynamical mean-field study