Abstract
We present our study of the dynamical susceptibility for a system of electrons in a narrow energy band. The Hamiltonian of the system consists of single-particle energies of electrons in the absence of interactions, the intra-atomic Coulomb interaction, and interatomic Coulomb and exchange interactions. An approximate expression for the susceptibility is derived by using the random-phase approximation. Instability of the paramagnetic state against the ferro- and the antiferromagnetic states is discussed. Also presented is the study of the dynamical susceptibility for a system of electrons with strong intra-atomic interactions where the validity of the random-phase approximation is dubious. In this case, in addition to the conditions for the paramagnetic instability against the ferro- and the antiferromagnetic states, we have also discussed the spin-wave excitations.
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.
