Enhanced superhyperfine structure of the EPR spectra of a U3+ ion introduced into the Van Vleck paramagnet LiTmF4 |
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Authors: | L. K. Aminov A. A. Ershova S. L. Korableva I. N. Kurkin A. A. Rodionov B. Z. Malkin |
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Affiliation: | (1) Kazan State University, Kazan, 420008, Russia |
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Abstract: | The observation of the superhyperfine structure (SHFS) in EPR spectra due to enhanced nuclear magnetism is reported. The X-band spectrum of a U3+ ion introduced into the Van Vleck paramagnet LiTmF4 is 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. The SHFS of Li(Lu, Y)F4:U3+ is due to the fluorine ions forming the nearest surroundings of the U3+ ion. The main contribution to the SHFS of the U3+ spectrum in LiTmF4 comes from the Tm3+ ions with a highly enhanced nuclear gyromagnetic tensor. The text was submitted by the authors in English. |
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