Electron spin resonance of Mn2+ impurities in monticellite

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Abstract
The electron spin resonance of Mn2+ impurity ions in natural crystals of monticellite, MgCaSiO4, was studied in the 9.4 GHz and 35 GHz microwave frequency ranges, and at room temperature. Four magnetic complexes of manganese were observed, and these were found to degenerate into two in the (010) crystallographic plane. The magnetic field separations of the spectral lines along the principal axes of the crystalline electric fields were the same for all four complexes. The resonance lines were fitted to a spin Hamiltonian of orthorhombic symmetry, and the following parameters were determined: gz = 1.9961, gy = 1.9905, b20 = −558.5, b22 = −351.7, b40 = −0.5, b42 = −56.0, b44 = −40.3, A = 85.5, B = 85.5. The values of bnm, A, and B are in gauss, and the signs are relative. It was possible to relate the axes of the Mn2+ magnetic complexes to the crystallographic axes. Hence, it was determined that the Mn2+ ions replace Mg2+ ions, which are in centers with inversion symmetry, and not Ca2+ ions, which are in centers containing a reflection plane.

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