Superhyperfine structure of the EPR spectra of [Ce.sup.3+] ions in LiR[F.sub.4] double fluorides

• Published in: Physics of the solid state 2010-10, Vol.52 (10), p.2070
• Main Authors: Aminov, L.K, Ershova, A.A, Efimov, V.N, Korableva, S.L, Kurkin, I.N, Malkin, B.Z, Rodionov, A.A
• Format: Article
• Language: English
• Subjects: Cerium; Fluorides; Magnetic fields; Toy industry
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783410100100

The EPR spectra of [Ce.sup.3+] impurity ions in LiY[F.sub.4], LiLu[F.sub.4], and LiTm[F.sub.4] double-fluoride single crystals have been investigated at a frequency of ~9.3 GHz in the temperature range 5-25 K. The effective g factors of the ground Kramers doublet of the cerium ions in three crystals are close to each other ([g.sub.∥] = 2.737, [g.sub.[perpendicular to]] = 1.475 for LiY[F.sub.4]:[Ce.sup.3+]). A superhyperfine structure of the EPR spectrum of [Ce.sup.3+] ions in the LiTm[F.sub.4] Van Vleck paramagnet has been observed in the external magnetic field B oriented along the crystallographic axis c (B ∥ c). The superhyperfine structure of the EPR soectra of the [Ce.sup.3+] ions in the LiY[F.sub.4] and LiLu[F.sub.4] diamagnetic matrices is resolved for B [perpendicular to] c. Possible factors responsible for this pronounced difference in the properties of the systems studied have been discussed.