Frustrated local-moment models for iron pnictide magnetism
Burkhard Schmidt, Mohammad Siahatgar, Peter Thalmeier
DOI 10.1103/PhysRevB.81.165101 · Physical Review B
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Abstract
The low-energy spin excitations of the Fe pnictide parent compounds have been determined by inelastic neutron scattering and interpreted within the local moment J1a,b−J2 Heisenberg model with orthorhombic symmetry. This has led to alternative exchange models that strongly differ in the size of anisotropy. Although the compounds are itinerant the localized spin model can explain basic features of the excitations. The inherent frustration of this model leads to quantum fluctuations and possible moment reduction. We investigate this question in detail using spin-wave approximation and partly exact diagonalization Lanczos calculations for finite clusters. We find that the orthorhombic anisotropy stabilizes the columnar antiferromagnetic phase and its moment. For the exchange models proposed from inelastic neutron scattering we can exclude a strong influence of frustration on the moment size. We also investigate dependence of magnetization and susceptibility on field and temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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