Abstract
We introduce a new approximation scheme for the periodic Andersonmodel (PAM). The modified alloy approximation represents an optimumalloy approximation for the strong-coupling limit, which can besolved within the coherent-potential-approximation formalism.Zero-temperature and finite-temperature phase diagrams are presentedfor the PAM in the intermediate-valence regime. The diversity ofmagnetic properties accessible by variation of the system parameterscan be studied by means of quasiparticle densities of states: theconduction band couples either ferromagnetically orantiferromagnetically to the f levels. A finite hybridization is anecessary precondition for ferromagnetism. However, too strong ahybridization generally suppresses ferromagnetism, but can forcertain system parameters also lead to a semi-metallic state withunusual magnetic properties. By comparing with the spectral densityapproximation, the influence of quasiparticle damping can beexamined.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
