Magnetic and Quasiparticle Excitation Spectra of an Itinerant J1−J2 Model for Iron-Pnictide Superconductors
C. M. S. da Conceição, M. B. Silva Neto, E. C. Marino
DOI 10.1103/PhysRevLett.106.117002 · Physical Review Letters
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Abstract
We calculate the magnetic and quasiparticle excitation spectra of an itinerant J1−J2 model for iron-pnictide superconductors. In addition to an acoustic spin-wave branch, the magnetic spectrum has a second, optical branch, resulting from the coupled four-sublattice magnetic structure. The spin-wave velocity has also a planar directional anisotropy, due to the collinear or striped antiferromagnetism. Within the magnetically ordered phase, the quasiparticle spectrum is composed of two Dirac cones, resulting from the folding of the magnetic Brillouin zone. We discuss the relevance of our findings to the understanding of both neutron scattering and photoemission spectroscopy results for SrFe2As2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | onset |
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