Magnetic Excitations in the High Tc Iron Pnictides
| dc.creator | Yao, Dao-Xin | |
| dc.creator | Carlson, Erica W. | |
| dc.date | 2008-04-25 | |
| dc.date | 2008-07-09 | |
| dc.date.accessioned | 2026-07-07T09:57:51Z | |
| dc.date.available | 2026-07-07T09:57:51Z | |
| dc.description | We calculate the expected finite frequency neutron scattering intensity based on the two-sublattice collinear antiferromagnet found by recent neutron scattering experiments as well as by theoretical analysis on the iron oxypnictide LaOFeAs. We consider two types of superexchange couplings between Fe atoms: nearest-neighbor coupling J1 and next-nearest-neighbor coupling J2. We show how to distinguish experimentally between ferromagnetic and antiferromagnetic J1. Whereas magnetic excitations in the cuprates display a so-called resonance peak at (pi,pi) (corresponding to a saddlepoint in the magnetic spectrum) which is at a wavevector that is at least close to nesting Fermi-surface-like structures, no such corresponding excitations exist in the iron pnictides. Rather, we find saddlepoints near (pi,pi/2) and (0,pi/2)(and symmetry related points). Unlike in the cuprates, none of these vectors are close to nesting the Fermi surfaces. | |
| dc.description | 4 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0804.4115 | |
| dc.identifier | http://arxiv.org/abs/0804.4115 | |
| dc.identifier | Phys. Rev. B 78, 052507 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.78.052507 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/167498 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Magnetic Excitations in the High Tc Iron Pnictides | |
| dc.type | text |