Dynamical nonlocal coherent-potential approximation for itinerant electron magnetism
arXiv:1409.5652 · doi:10.1088/0953-8984/26/47/475602
Abstract
A dynamical generalisation of the nonlocal coherent-potential approximation is derived based upon the functional integral approach to the interacting electron problem. The free energy is proven to be variational with respect to the self-energy provided a self-consistency condition on a cluster of sites is satisfied. In the present work, calculations are performed within the static approximation and the effect of the nonlocal physics on the formation of the local moment state in a simple model is investigated. The results reveal the importance of the dynamical correlations.
arXiv comment20 pages, 6 figures
References in corpus (9)
- The Dynamical Cluster Approximation: Non-Local Dynamics of Correlated Electron Systems
- Systematic and Causal Corrections to the Coherent Potential Approximation
- Non-equilibrium dynamics of the Anderson impurity model
- ARPES Spectra of the Hubbard model
- The Korringa-Kohn-Rostoker Non-Local Coherent Potential Approximation (KKR-NLCPA)
- First-Principles Dynamical Coherent-Potential Approximation Approach to the Ferromagnetism of Fe, Co, and Ni
- Investigation of the nonlocal coherent-potential approximation
- Effective Cluster Typical Medium Theory for Diagonal Anderson Disorder Model in One- and Two-Dimensions
- Ferromagnetism of transition metals and screened exchange interactions