Journal
FRONTIERS OF PHYSICS IN CHINA
Volume 5, Issue 2, Pages 166-170Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-009-0075-x
Keywords
iron-based superconductor; 3-D Heisenberg model; spin-wave; neutron scattering; sublattice mangetization
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Funding
- Research Corporation
- NSF [DMR 08-04748]
- Direct For Mathematical & Physical Scien [0804748] Funding Source: National Science Foundation
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We study the magnetic excitations of undoped iron oxypnictides using a three-dimensional Heisenberg model with single-ion anisotropy. Analytic forms of the spin-wave dispersion, velocities, and structure factor are given. Aside from quantitative comparisons that can be made to inelastic neutron scattering experiments, we also give qualitative criteria that can distinguish various regimens of coupling strength. The magnetization reduction due to quantum zero point fluctuations shows clear dependence on the c-axis coupling.
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