Abstract
AbstractThe electron paramagnetic resonance (EPR) spectrum of Mn2+ ions in ferroelectric guanidinium aluminium sulfate hexahydrate is analyzed. It turned out that these impurity ions enter into regular Al3+ lattice sites forming two non‐equivalent magnetic hexaquo‐manganese (II) complexes of axial symmetry. The hyperfine lines of several fine‐structure transitions exhibit a hidden “spin‐flip” satellite structure. It results from the proton ligand hyperfine interaction in the magnetic hexaquocomplexes. A strong dependence on temperature and uniaxial stress is found for the zero‐field splitting parameter D. Its variation with temperature is discussed in terms of thermal lattice expansion and local lattice vibration effects.
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