Abstract
Electron paramagnetic resonance studies of Mn 2+ ion doping single crystals of nickel acetate tetrahydrate ( Ni( CH 3 COO) 2·4 H 2 O) and nickel potassium tutton salt ( NiK 2( SO 4) 2·6 H 2 O) have been made at room, liquid-nitrogen, and liquid-helium temperatures. In order to understand the interaction of the Mn 2+ ion with the surrounding Ni 2+ ions, studies of line widths as a function of temperature and of external magnetic field intensity have been made. The absolute signs of the parameters have been determined from the relative intensity of lines at liquid-helium temperature. The values of the parameters have been computed using a rigorous least-squares fitting procedure, and exact diagonalization of the spin Hamiltonian matrix, fitting simultaneously the resonant line positions obtained for several orientations of the magnetic field.
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