Abstract
EPR spectra of impurity Nd3+ and Er3+ ions in aluminum borates YAl3(BO3)4 and EuAl3(BO3)4 have been studied. Dependences of g-factors and linewidth as a function of temperature are established, and the hyperfine interaction constants are determined. Temperature dependences of linewidth of Nd3+ and Er3+ ions in both crystals are identical. The absorption line broadening with increasing temperature is caused by strong spin–phonon interaction and is described by the Orbach–Aminov process. Unlike Nd3+ ion, an anisotropy of temperature dependence of Er3+ ion linewidth is observed. The relaxation velocity of Er3+ ions is lower then that of Nd3+ ions. The anisotropy of spin–lattice relaxation observed for Er3 ion is due to a large g-factor anisotropy which is larger in the EuAl3(BO3)4 crystal than in YAl3(BO3)4 one. A decrease of g-factor of Er3+ ion in both crystals with increasing temperature is shown to result from spin–phonon interaction.
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