Premium
Spin wave stiffness constant of narrow‐band ferromagnetic alloys with random hopping
Author(s) -
Kolley E.,
Kolley W.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220920216
Subject(s) - condensed matter physics , ferromagnetism , diagonal , physics , spin wave , kubo formula , electron , spin (aerodynamics) , constant (computer programming) , hubbard model , vertex (graph theory) , electrical resistivity and conductivity , quantum mechanics , quantum electrodynamics , superconductivity , conductivity , mathematics , graph , geometry , discrete mathematics , computer science , thermodynamics , programming language
The spin wave stiffness constant D of ferromagnetic binary metallic alloys is derived at zero temperature from a random Hubbard model including diagonal and off‐diagonal disorder. The fluctuations of the hopping integrals are restricted to the additive limit. Vertex corrections to D due to the randoness of the transverse spin current are calculated in an extended CPA. D is renormalized by electron‐electron correlations within the coherent horizontal ladder approximation. Stability and damping of the spin waves, Ward relations, and the electrical conductivity are discussed.