Abstract:
In LiCaAlF$_6$:Cr single crystals, paramagnetic resonance spectra of isolated Cr$^{3+}$ centers and uncontrolled Mn$^{2+}$, Gd$^{3+}$, V$^{2+}$ impurities were detected in several samples with different chromium concentrations. The parameters of the spin Hamiltonians Cr$^{3+}$, Gd$^{3+}$, V$^{2+}$ are determined. Near the signals of Cr$^{3+}$ centers, weak satellites were observed, attributed to transitions of interacting pairs of chromium ions.
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