Abstract
The Coulomb interaction among conduction electrons is introduced in the Kondo-lattice Hamiltonian. According to the Perron-Frobenius theorem, we exactly show that the ground state of the Kondo lattice in one dimension with the open boundary condition is ferromagnetic and has the total spin S=(N-${\mathit{N}}_{\mathit{c}}$)/2 in the limit U\ensuremath{\rightarrow}\ensuremath{\infty}, where N is the number of sites and ${\mathit{N}}_{\mathit{c}}$ is the number of conduction electrons. Exact-diagonalization calculations clearly indicate that the ferromagnetic state appears for a wide range of Coulomb strength. Our theory predicts that antiferromagnetic correlations of localized spins change into ferromagnetic ones with the increase of Coulomb interactions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.