Abstract
ENDOR techniques have been used at 4.2 K to investigate the hyperfine splittings of Mn 2+ in KMgF 3, KZnF 3, KCdF 3, and RbCdF 3. The spectra could be analysed in terms of a spin hamiltonian of cubic symmetry including some higher-order interaction terms. The lattice parameters have been determined at temperatures of 295 and 125 K in order to study the influence of small changes in fluorine ion-magnetic ion distances on the hyperfine interaction. It will be argued that the larger hfs constant found in KMgF 3 may be understood on the basis of a significantly smaller covalent bonding. A new value for the hfs constant of Mn in antiferromagnetic KMnF 3 and RbMnF 3 is estimated from our data, yielding a ground-state spin alignment of the cubic antiferromagnets which differs from the results of first-order perturbation calculations within the framework of spin-wave theory, if the supertransferred hyperfine interaction is taken into account as calculated by Owen and Taylor.
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