Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-30
Phys. Rev. B 81 (2010) 165101
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 9 figures, minor changes to the text, references updated
Scientific paper
10.1103/PhysRevB.81.165101
The low energy spin excitations of the Fe pnictide parent compounds have been determined by inelastic neutron scattering and interpreted within the local moment J_1a,b-J_2 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 localised 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 diagonalisation Lanczos calculations for finite clusters. We find that the orthorhombic anisotropy stabilizes the columnar AF phase and its moment. For the exchange models proposed from inelastic neutron scattering we can exclude a strong influcence of frustration on the moment size. We also investigate dependence of magnetisation and susceptibility on field and temperature.
Schmidt Burkhard
Siahatgar Mohammad
Thalmeier Peter
No associations
LandOfFree
Frustrated local moment models for Fe-pnictide magnetism does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Frustrated local moment models for Fe-pnictide magnetism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frustrated local moment models for Fe-pnictide magnetism will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-149402