Abstract
The polarized absorption spectra of the Nd 3+ ion in a LiYF 4 host are registered at room temperature, 150 K and 4.2 K in the spectral region of 200–2500 nm. The crystal field energy levels are derived and the wave functions are optimized using a set of parameters (real and imaginary), representative for the crystal field symmetry S 4. The composition of the crystal field wave functions is checked in a simulation of the magnetic properties of the LiYF 4/Nd 3+ complex: the parallel and perpendicular magnetic susceptibilities are measured from 4.2 K up to 300 K. The simulation is based on the Van Vleck formula, using the optimized crystal field wave functions of the 18 lowest crystal field levels.
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