Abstract
The ion-based superconductor [Formula: see text] has received much attention because this rare earth oxypnictide belongs to a new class [Formula: see text] of high-[Formula: see text] superconductors with critical temperatures surpassed by high-[Formula: see text] copper oxides. Since the [Formula: see text] is situated near the superconducting FeAs plane, it can be used as a probe to study the influence of superconductivity on spin dynamic properties of the FeAs layer. It is important to determine the optical and magnetic properties of rare earth ion in oxypnictides. Here, based on the crystal–field theory, the crystal–field (CF) energy levels and electron paramagnetic resonance parameters [Formula: see text] factors of [Formula: see text] in [Formula: see text] are studied by diagonalizing the full energy matrix. In the calculations, the contributions of various admixtures and interactions are all considered. The results are discussed.
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