Influence of Strong Electron–Electron Correlations on the Electrical Conduction and Magnetic Properties of Substitutional Alloys as Advanced Functional Spintronic Materials

In this work, we review and analyze a nature of the magnetic effects by means of illustrations for some representative substitutional alloys based on transition metals, particularly, on an example of the body-centered cubic Fe–Co. Within the scope of the cluster expansion for both the Green’s functions and the thermodynamic potential of a disordered crystalline system with strong electron correlations, the essential features of magnetic and transport properties of substitutional transition-metal alloys (such as b.c.c.-Fe–Co) are described. These properties are found to be concerned to the Fermi-level position relative to the quasi-gap that appears in the energy spectrum of electrons due to the strong electron–electron interaction. The contribution and role of electron–phonon interactions in the electron spectrum reconfiguration are detected and elucidated.