TOPOLOGY OF SPIN HAMILTONIAN TENSORS OF Mn*992*99+ AND Fe*993*99+ IONS AND QUADRATIC TENSOR PRODUCTS OF CRYSTALLINE FIELD IN MONOCRYSTALS

The aim is to perform the experimental determination of the spin Hamiltonian parameters of Mn*992*99+ and Fe*993*99+ ions, to compare the logical properties of the obtained spin Hamiltonian tensors with quadratic tensor products of the crystalline field in the substitution positions. To solve these problems the EPR method was used, the basic measurements have been performed on the spectrometer witn working frequency 37 GHz. The spin Hamiltonian parameters for all the studied objects have been determined. It has been shown that the tensors of the second and fourth rank spin Hamiltonian of Mn*992*99+ and Fe*993*99+ ions depend mainly and quadratically upon the fourth rank tensor of the crystalline field, but the invariant sum of the fourth rank tensor of the spin Hamiltonian is the criterion of distinguishing the tetrahedral and octahedral complexes Fe*993*99+ in crystalsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio