Abstract
Electron paramagnetic resonance (EPR) is used to identify the different substitution sites ofYb3+ ionsin the LuVO4 host. Three different types of sites are observed. One site, referred to asYbI, with tetragonalD2d symmetrycharacterized by g-values of and , corresponds to 80% (50%) of the total number ofYb3+ ions for the 1% (5%) doped compound. Two other tetragonal sites, referred to asYbII a,II b, with the sameD2d symmetry andcharacterized by g-values of , and , , represent 20% (50%) of the total number of ytterbium ionsfor the 1% (5%) compound. One minor site, referred to asYbIII, corresponding toless than 1% of the Yb3+ ions, with a lower C2v or D2 symmetry, is also seen in the EPR spectra. The temperature dependence of the EPR linewidth isstudied and shows for all the sites a dominant Orbach process for the spin–lattice relaxation timeT1 for T>12 K.
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