材料期刊网

The spin Hamiltonian (SH) parameters g factors g parallel to, g perpendicular to and the hyperfine structure constants A parallel to and A perpendicular to for the tetragonal Cu2+ centers (i.e., [CUX4(H2O)(2)] clusters) in NH4X (X = Cl, Br, I) are theoretically investigated by means of the diagonalization procedure of complete (10 x 10) energy matrix (DPCEM) for a 3d(9) ion in tetragonal symmetry. The crystal-field parameters in the energy matrix are determined from the superposition model. The calculated SH parameters are in reasonable agreement with the experimental data.