Electron paramagnetic resonance (EPR) is used to identify the different substitution sites of Yb3+ ions in the LuVO4 host. Three different types of sites are observed. One site, referred to as YbI, with tetragonal D2d symmetry characterized by g-values of and , corresponds to 80% (50%) of the total number of Yb3+ ions for the 1% (5%) doped compound. Two other tetragonal sites, referred to as YbII a,II b, with the same D2d symmetry and characterized by g-values of , and , , represent 20% (50%) of the total number of ytterbium ions for the 1% (5%) compound. One minor site, referred to as YbIII, corresponding to less 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 is studied and shows for all the sites a dominant Orbach process for the spin-lattice relaxation time T1 for T>12 K.

Electron paramagnetic resonance study of the multisite character of Yb3+ ions in LuVO4 single crystals

BETTINELLI, Marco Giovanni;
2005-01-01

Abstract

Electron paramagnetic resonance (EPR) is used to identify the different substitution sites of Yb3+ ions in the LuVO4 host. Three different types of sites are observed. One site, referred to as YbI, with tetragonal D2d symmetry characterized by g-values of and , corresponds to 80% (50%) of the total number of Yb3+ ions for the 1% (5%) doped compound. Two other tetragonal sites, referred to as YbII a,II b, with the same D2d symmetry and characterized by g-values of , and , , represent 20% (50%) of the total number of ytterbium ions for the 1% (5%) compound. One minor site, referred to as YbIII, corresponding to less 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 is studied and shows for all the sites a dominant Orbach process for the spin-lattice relaxation time T1 for T>12 K.
RARE-EARTH IMPURITIES; EPR INVESTIGATIONS; THERMAL-CONDUCTIVITY
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11562/305049
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