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| VOLUME 87 | ISSUE 6 |
PAGE 362
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| Enhanced super-hyperfine structure of EPR spectra of U3+ ion in the Van Vleck paramagnet LiTmF4 |
L. K. Aminov, A. A. Ershova, S. L. Korableva, I. N. Kurkin, A. A. Rodionov, B. Z. Malkin
Kazan State University, 420008 Kazan, Russia
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PACS: 75.10.Dg, 75.30.Et, 76.30.Kg
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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.
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