Superhyperfine structure of the EPR spectra of Nd3+ and U3+ ions in LiRF4 (R = Y, Lu, Tm) double fluorides

Abstract

The superhyperfine structure of the EPR spectra of impurity Nd3+ and U3+ ions in LiYF4, LiLuF4, and LiTmF4 double-fluoride single crystals has been observed and discussed. In LiYF4: Nd (g{pipe} = 1. 987, g⊥ = 2. 554) and LiTmF4: Nd, the superhyperfine structure is observed at the orientation of the external magnetic field B in parallel to the c axis of the crystals and consists of nine components with a splitting of ~15. 4 MHz. In LiYF4: U (g{pipe} = 1. 149, g⊥ = 2. 508) and LiLuF4: U, the superhyperfine structure is observed at both B {pipe} c and B ⊥ c and consists of nine and eleven components, respectively, with a splitting of ~21. 5MHz. It should be noted that the resolution of the superhyperfine structure of the EPR spectrum of LiLuF4: U3+ becomes significantly higher with a deviation from the orientation B ⊥ c. © 2011 Pleiades Publishing, Ltd.