Abstract
The wave functions of Co2+ and Fe2+ ions near the ground state in the CaCO3− type lattice have been calculated from EPR data in the Abragam-Pryce approximation. The orbital angular momentum contributions to the anisotropic and antisymmetric parts of exchange coupling are determined assuming that this interaction between the magnetic ions occurring in nonequivalent positions is isotropic with respect to spin orientations. It is shown that, in the given approximation, the exchange coupling components in the basal plane for such Fe2+−Fe2+ and Co2+− Fe2+ ion pairs are missing. This fact explains the uniaxial antiferromagnetic ordering in FeCO3 and the presence of a low-lying oscillation branch for Fe2+ impurity ions in antiferromagnetic CoCO3. The EPR spectra of exchange-coupled Co2+−Co2+, Fe2+−Fe2+, and Co2+−Fe2+ pairs occupying nonequivalent positions have been calculated and their parameters have been numerically estimated.
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.
