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VOLUME 87 (2008) | ISSUE 6 | PAGE 362
Enhanced super-hyperfine structure of EPR spectra of U3+ ion in the Van Vleck paramagnet LiTmF4
PACS: 75.10.Dg, 75.30.Et, 76.30.Kg
Abstract
The observation of the super-hyperfine structure (SHFS) of EPR spectra due to enhanced nuclear magnetism is reported. The X-band spectrum of U3 +  ion introduced into the Van Vleck paramagnet LiTmF4 was measured in the temperature range of 5-20 K and compared with the spectra of LiLuF4:U3 +  and LiYF4:U3 +  single crystals. The spectra reveal well resolved and strikingly different SHFS. SHFS of Li(Lu,Y)F4:U3 +  is due to fluorine ions forming the nearest surroundings of the U3 +  ion. The main contribution to SHFS of the U3 +  spectrum in LiTmF4 is coming from Tm3 +  ions with highly enhanced nuclear gyromagnetic tensor.